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2026-07-02 18:12:31 -04:00
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Fastfox.js
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@@ -3,7 +3,7 @@
* Fastfox *
* "Non ducor duco" *
* priority: speedy browsing *
* version: 150 *
* version: 152 *
* url: https://github.com/yokoffing/Betterfox *
***************************************************************************************/
@@ -26,7 +26,7 @@
// Increases font cache size to improve performance on text-heavy websites.
// Especially beneficial for sites with many font faces or complex typography.
// [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1239151#c2
//user_pref("gfx.content.skia-font-cache-size", 32); // 32 MB; default=5; Chrome=20
user_pref("gfx.content.skia-font-cache-size", 20); // 20 MB; default=5; Chrome=20
// PREF: page reflow timer
// Rather than wait until a page has completely downloaded to display it to the user,
@@ -53,17 +53,13 @@
// [1] https://searchfox.org/mozilla-central/rev/c1180ea13e73eb985a49b15c0d90e977a1aa919c/modules/libpref/init/StaticPrefList.yaml#1824-1834
// [2] https://web.archive.org/web/20240115073722/https://dev.opera.com/articles/efficient-javascript/?page=3#reflow
// [3] https://web.archive.org/web/20240115073722/https://dev.opera.com/articles/efficient-javascript/?page=3#smoothspeed
//user_pref("content.notify.interval", 100000); // (.10s); default=120000 (.12s)
//user_pref("content.max.tokenizing.time", 1000000); // (1.00s); alt=2000000; HIDDEN
//user_pref("content.interrupt.parsing", true); // HIDDEN
user_pref("content.notify.interval", 100000); // (.10s); default=120000 (.12s)
//user_pref("content.max.tokenizing.time", 1000000); // (1.00s); alt=2000000; HIDDEN
//user_pref("content.interrupt.parsing", true); // HIDDEN
// PREF: UI responsiveness threshold
//user_pref("content.switch.threshold", 300000); // HIDDEN; default= 750000; alt=500000
// PREF: split text nodes to a length
// The number of bytes in a text node.
//user_pref("content.maxtextrun", 8191); // DEFAULT; HIDDEN
// PREF: new tab preload
// [WARNING] Disabling this may cause a delay when opening a new tab in Firefox.
// [1] https://wiki.mozilla.org/Tiles/Technical_Documentation#Ping
@@ -90,18 +86,6 @@
// PREF: disable preSkeletonUI on startup [WINDOWS]
//user_pref("browser.startup.preXulSkeletonUI", false);
// PREF: lazy load iframes
//user_pref("dom.iframe_lazy_loading.enabled", true); // DEFAULT [FF121+]
// PREF: Prioritized Task Scheduling API
// [1] https://github.com/yokoffing/Betterfox/issues/355
// [2] https://blog.mozilla.org/performance/2022/06/02/prioritized-task-scheduling-api-is-prototyped-in-nightly/
// [3] https://medium.com/airbnb-engineering/building-a-faster-web-experience-with-the-posttask-scheduler-276b83454e91
// [4] https://github.com/WICG/scheduling-apis/blob/main/explainers/prioritized-post-task.md
// [5] https://wicg.github.io/scheduling-apis/
// [6] https://caniuse.com/mdn-api_taskcontroller
//user_pref("dom.enable_web_task_scheduling", true); // DEFAULT [FF142+]
/****************************************************************************
* SECTION: GFX RENDERING TWEAKS *
****************************************************************************/
@@ -122,8 +106,8 @@
// [2] https://www.reddit.com/r/firefox/comments/1p58qre/firefox_is_getting_ready_to_make_youtube_fast/
// [3] https://www.ghacks.net/2025/11/24/these-two-tweaks-should-improve-firefoxs-performance-on-youtube-significantly/
//user_pref("gfx.webrender.layer-compositor", true);
// If your PC uses an AMD GPU, you might want to make a second change.
// This one improves CPU usage on AMD systems.
// PREF: improve CPU usage on AMD systems
//user_pref("media.wmf.zero-copy-nv12-textures-force-enabled", true);
// PREF: if your hardware doesn't support Webrender, you can fallback to Webrender's software renderer
@@ -142,78 +126,70 @@
// [2] https://github.com/yokoffing/Betterfox/issues/153
// [3] https://github.com/yokoffing/Betterfox/issues/198
//user_pref("gfx.canvas.accelerated", true); // [DEFAULT FF133+]
//user_pref("gfx.canvas.accelerated.cache-items", 4096); // [default=8192 FF135+]; Chrome=4096
//user_pref("gfx.canvas.accelerated.cache-size", 512); // default=256; Chrome=512
//user_pref("gfx.canvas.max-size", 32767); // DEFAULT=32767
//user_pref("gfx.canvas.accelerated.cache-items", 8192); // [DEFAULT FF135+]
user_pref("gfx.canvas.accelerated.cache-size", 512); // default=256; Chrome=512; max=2048
//user_pref("gfx.canvas.max-size", 32767); // [DEFAULT]
// PREF: WebGL
//user_pref("webgl.max-size", 16384); // default=1024
//user_pref("webgl.force-enabled", true);
/****************************************************************************
* SECTION: JAVASCRIPT OPTIONS *
****************************************************************************/
// PREF: lower the Baseline JIT compilation threshold
// Controls how many times a function runs before Firefox promotes it from the
// C++ interpreter to the Baseline JIT compiler. The Baseline JIT compiles each
// bytecode instruction into a small piece of machine code and uses Inline Caches
// (ICs) to both speed up execution and collect type info for the Ion optimizing JIT.
// Lowering this from 100 to 50 promotes "warm" functions to compiled machine code
// sooner, which reduces dropped frames while browsing.
// [1] https://ra1ahq.blog/en/optimizaciya-proizvoditelnosti-mozilla-firefox-chast-1
user_pref("javascript.options.baselinejit.threshold", 50); // default=100
// PREF: prefer GPU over CPU
// At best, the prefs do nothing on Linux/macOS.
// At worst, it'll result in crashes if the sandboxing is a WIP.
// [1] https://firefox-source-docs.mozilla.org/dom/ipc/process_model.html#gpu-process
//user_pref("layers.gpu-process.enabled", true); // DEFAULT WINDOWS
//user_pref("layers.gpu-process.force-enabled", true); // enforce
//user_pref("layers.mlgpu.enabled", true); // LINUX
//user_pref("media.hardware-video-decoding.enabled", true); // DEFAULT WINDOWS macOS
//user_pref("media.hardware-video-decoding.force-enabled", true); // enforce
//user_pref("media.gpu-process-decoder", true); // DEFAULT WINDOWS
//user_pref("media.ffmpeg.vaapi.enabled", true); // LINUX
// PREF: raise the IonMonkey (Ion) optimizing-JIT compilation threshold
// Controls how many times a function runs before Firefox promotes it from the
// Baseline JIT to IonMonkey, the optimizing JIT. Ion applies advanced compiler
// optimizations to produce fast code for "hot" functions, at the cost of slower
// compilation. The Baseline JIT is quicker to produce but can't cope with the large
// amounts of code on heavy websites.
// Raising this threshold keeps more code on the faster-to-compile Baseline JIT,
// reserving the expensive Ion compilation for only the hottest functions.
// [1] https://ra1ahq.blog/en/optimizaciya-proizvoditelnosti-mozilla-firefox-chast-1
//user_pref("javascript.options.ion.threshold", 1500); // DEFAULT
// PREF: hardware and software decoded video overlay [FF116+]
// [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1829063
// [2] https://phabricator.services.mozilla.com/D175993
//user_pref("gfx.webrender.dcomp-video-hw-overlay-win", true); // DEFAULT
//user_pref("gfx.webrender.dcomp-video-hw-overlay-win-force-enabled", true); // enforce
//user_pref("gfx.webrender.dcomp-video-sw-overlay-win", true); // DEFAULT
//user_pref("gfx.webrender.dcomp-video-sw-overlay-win-force-enabled", true); // enforce
// PREF: decrease concurrent JavaScript garbage collection (GC) threads
// Sets the divisor in the formula: GC threads = CPU threads ÷ divisor (min 1).
// A LOWER value = MORE parallel GC threads. A HIGHER value = FEWER threads.
// Example (24-thread CPU): divisor 1 → 24 threads | 2 → 12 | 4 (default) → 6 | 12 → 2
// Power users with many cores should LOWER this value, not raise it.
// [NOTE] Mozilla's default of 4 is conservative to avoid thread contention on weak hardware.
//user_pref("javascript.options.concurrent_multiprocess_gcs.cpu_divisor", 4); // DEFAULT
/****************************************************************************
* SECTION: DISK CACHE *
****************************************************************************/
// PREF: force a fixed max cache size on disk
// NOTE: You need this set to false if you are to edit the disk capacity value
// [1] https://support.mozilla.org/en-US/questions/1271481
//user_pref("browser.cache.disk.smart_size.enabled", false);
// PREF: disk cache size
// [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=913808,968106,968101
// [2] https://rockridge.hatenablog.com/entry/2014/09/15/165501
// [3] https://www.reddit.com/r/firefox/comments/17oqhw3/firefox_and_ssd_disk_consumption/
//user_pref("browser.cache.disk.smart_size.enabled", false); // force a fixed max cache size on disk
//user_pref("browser.cache.disk.capacity", 512000); // default=256000; size of disk cache; 1024000=1GB, 2048000=2GB
//user_pref("browser.cache.disk.max_entry_size", 51200); // DEFAULT (50 MB); maximum size of an object in disk cache
// PREF: Race Cache With Network (RCWN) [FF59+]
// [ABOUT] about:networking#rcwn
// Firefox concurrently sends requests for cached resources to both the
// local disk cache and the network server. The browser uses whichever
// result arrives first and cancels the other request. This approach sometimes
// loads pages faster because the network can be quicker than accessing the cache
// on a hard drive. When RCWN is enabled, the request might be served from
// the server even if you have valid entry in the cache. Set to false if your
// intention is to increase cache usage and reduce network usage.
// [1] https://slides.com/valentingosu/race-cache-with-network-2017
// [2] https://simonhearne.com/2020/network-faster-than-cache/
// [3] https://support.mozilla.org/en-US/questions/1267945
// [4] https://askubuntu.com/questions/1214862/36-syns-in-a-row-how-to-limit-firefox-connections-to-one-website
// [5] https://bugzilla.mozilla.org/show_bug.cgi?id=1622859
// [6] https://soylentnews.org/comments.pl?noupdate=1&sid=40195&page=1&cid=1067867#commentwrap
//user_pref("network.http.rcwn.enabled", false);
// PREF: attempt to RCWN only if a resource is smaller than this size
//user_pref("network.http.rcwn.small_resource_size_kb", 256); // DEFAULT
// PREF: cache memory pool
// Cache v2 provides a memory pool that stores metadata (such as response headers)
// for recently read cache entries [1]. It is managed by a cache thread, and caches with
// metadata in the pool appear to be reused immediately.
// [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=986179
//user_pref("browser.cache.disk.metadata_memory_limit", 16384); // default=250 (0.25 MB); limit of recent metadata we keep in memory for faster access
//user_pref("browser.cache.disk.metadata_memory_limit", 1024); // DEFAULT (1 MB); limit of recent metadata we keep in memory for faster access
// PREF: number of chunks we preload ahead of read
// Large content such as images will load faster.
// [1] https://bugzilla.mozilla.org/buglist.cgi?bug_id=913819,988318
// [2] http://www.janbambas.cz/new-firefox-http-cache-enabled/
//user_pref("browser.cache.disk.preload_chunk_count", 4); // DEFAULT
//user_pref("browser.cache.disk.preload_chunk_count", 8); // default=4
// PREF: the time period used to re-compute the frecency value of cache entries
// The frequency algorithm is used to select entries, and entries that are recently
@@ -262,9 +238,9 @@
//user_pref("browser.cache.jsbc_compression_level", 3);
// PREF: strategy to use for when the bytecode should be encoded and saved [TESTING ONLY]
// -1 makes page load times marginally longer when a page is being loaded for the first time, while
// -1 = makes page load times marginally longer when a page is being loaded for the first time, while
// subsequent reload of websites will be much much faster.
// 0 means that the bytecode is created every 4 page loads [3].
// 0 = the bytecode is created every 4 page loads [3].
// [1] https://searchfox.org/mozilla-release/source/modules/libpref/init/StaticPrefList.yaml#3461-3488
// [2] https://www.reddit.com/r/firefox/comments/12786yv/improving_performance_in_firefox_android_part_ii/
// [3] https://github.com/zen-browser/desktop/issues/217
@@ -288,8 +264,8 @@
// [1] https://kb.mozillazine.org/Browser.cache.memory.capacity#-1
// [2] https://searchfox.org/mozilla-central/source/netwerk/cache2/CacheObserver.cpp#94-125
// [3] https://github.com/WaterfoxCo/Waterfox/commit/3fed16932c80a2f6b37d126fe10aed66c7f1c214
//user_pref("browser.cache.memory.capacity", 131072); // 128 MB RAM cache; alt=65536 (65 MB RAM cache); default=32768
//user_pref("browser.cache.memory.max_entry_size", 20480); // 20 MB max entry; default=5120 (5 MB)
//user_pref("browser.cache.memory.capacity", 65536); // default=32768 (32 MB)
//user_pref("browser.cache.memory.max_entry_size", 10240); // default=5120 (5 MB)
// PREF: amount of Back/Forward cached pages stored in memory for each tab
// Pages that were recently visited are stored in memory in such a way
@@ -300,7 +276,7 @@
// is no reason for Firefox to keep memory for this.
// -1=determine automatically (8 pages)
// [1] https://kb.mozillazine.org/Browser.sessionhistory.max_total_viewers#Possible_values_and_their_effects
//user_pref("browser.sessionhistory.max_total_viewers", 4); // default=8
//user_pref("browser.sessionhistory.max_total_viewers", 8); // DEFAULT
//user_pref("browser.sessionstore.max_tabs_undo", 10); // default=25
//user_pref("browser.sessionstore.max_entries", 10); // [HIDDEN OR REMOVED]
//user_pref("dom.storage.default_quota", 20480); // 20MB; default=5120
@@ -330,18 +306,18 @@
//user_pref("media.mediasource.enabled", true); // DEFAULT
// PREF: adjust video buffering periods when not using MSE (in seconds)
// [NOTE] Does not affect videos over 720p since they use DASH playback [1]
// [NOTE] Does not affect videos over 720p since they use DASH playback [1] or Web Audio API
// [1] https://lifehacker.com/preload-entire-youtube-videos-by-disabling-dash-playbac-1186454034
//user_pref("media.cache_readahead_limit", 600); // 10 min; default=60; stop reading ahead when our buffered data is this many seconds ahead of the current playback
//user_pref("media.cache_resume_threshold", 300); // 5 min; default=30; when a network connection is suspended, don't resume it until the amount of buffered data falls below this threshold
user_pref("media.cache_readahead_limit", 3600); // 10 min; default=60; stop reading ahead when our buffered data is this many seconds ahead of the current playback
user_pref("media.cache_resume_threshold", 1800); // 5 min; default=30; when a network connection is suspended, don't resume it until the amount of buffered data falls below this threshold
/****************************************************************************
* SECTION: IMAGE CACHE *
****************************************************************************/
// PREF: image cache
//user_pref("image.cache.size", 10485760); // (cache images up to 10MiB in size) [DEFAULT 5242880]
//user_pref("image.mem.decode_bytes_at_a_time", 65536); // default=16384; alt=32768; chunk size for calls to the image decoders
//user_pref("image.cache.size", 20971520); // (cache images up to 20 MiB in size) [DEFAULT]
user_pref("image.mem.decode_bytes_at_a_time", 32768); // default=16384; chunk size for calls to the image decoders
//user_pref("image.mem.max_decoded_image_kb", 512000); // 500MB [HIDDEN OR REMOVED?]
// PREF: set minimum timeout to unmap shared surfaces since they have been last used
@@ -362,18 +338,18 @@
// [1] https://www.mail-archive.com/support-seamonkey@lists.mozilla.org/msg74561.html
// [2] https://github.com/yokoffing/Betterfox/issues/279
// [3] https://ra1ahq.blog/en/optimizaciya-proizvoditelnosti-mozilla-firefox
//user_pref("network.buffer.cache.size", 65535); // default=32768 (32 kb); 262144 too large
//user_pref("network.buffer.cache.count", 48); // default=24; 128 too large
user_pref("network.buffer.cache.size", 65535); // default=32768 (32 kb); 262144 too large
user_pref("network.buffer.cache.count", 48); // default=24; 128 too large
// PREF: increase the absolute number of HTTP connections
// [1] https://kb.mozillazine.org/Network.http.max-connections
// [2] https://kb.mozillazine.org/Network.http.max-persistent-connections-per-server
// [3] https://www.reddit.com/r/firefox/comments/11m2yuh/how_do_i_make_firefox_use_more_of_my_900_megabit/jbfmru6/
//user_pref("network.http.max-connections", 1800); // default=900
//user_pref("network.http.max-persistent-connections-per-server", 10); // default=6; download connections; anything above 10 is excessive
//user_pref("network.http.max-urgent-start-excessive-connections-per-host", 5); // default=3
//user_pref("network.http.max-persistent-connections-per-proxy", 48); // default=32
//user_pref("network.http.request.max-start-delay", 5); // default=10
user_pref("network.http.max-connections", 1800); // default=900
user_pref("network.http.max-persistent-connections-per-server", 10); // default=6; download connections; anything above 10 is excessive
user_pref("network.http.max-urgent-start-excessive-connections-per-host", 5); // default=3
//user_pref("network.http.max-persistent-connections-per-proxy", 32); // default=32
user_pref("network.http.request.max-start-delay", 5); // default=10
//user_pref("network.websocket.max-connections", 200); // DEFAULT
// PREF: pacing requests [FF23+]
@@ -386,17 +362,17 @@
// false = Firefox will send as many requests as possible without pacing
// true = Firefox will pace requests (default)
//user_pref("network.http.pacing.requests.enabled", false);
//user_pref("network.http.pacing.requests.min-parallelism", 10); // default=6
//user_pref("network.http.pacing.requests.burst", 32); // default=10
//user_pref("network.http.pacing.requests.min-parallelism", 12); // default=6
//user_pref("network.http.pacing.requests.burst", 20); // default=10
// PREF: increase DNS cache
// [1] https://developer.mozilla.org/en-US/docs/Web/Performance/Understanding_latency
//user_pref("network.dnsCacheEntries", 10000); // default=800
//user_pref("network.dnsCacheEntries", 1600); // default=800
// PREF: adjust DNS expiration time
// [ABOUT] about:networking#dns
// [NOTE] These prefs will be ignored by DNS resolver if using DoH/TRR.
//user_pref("network.dnsCacheExpiration", 3600); // keep entries for 1 hour; default=60
user_pref("network.dnsCacheExpiration", 3600); // keep entries for 1 hour; default=60
//user_pref("network.dnsCacheExpirationGracePeriod", 120); // default=60; cache DNS entries for 2 minutes after they expire
// PREF: the number of threads for DNS
@@ -404,16 +380,7 @@
//user_pref("network.dns.max_any_priority_threads", 24); // DEFAULT [FF 123?]
// PREF: increase TLS token caching
//user_pref("network.ssl_tokens_cache_capacity", 10240); // default=2048; more TLS token caching (fast reconnects)
/****************************************************************************
* SECTION: EXPERIMENTAL *
****************************************************************************/
// PREF: CSS Masonry Layout [NIGHTLY]
// [1] https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Grid_Layout/Masonry_Layout
// [2] https://www.smashingmagazine.com/native-css-masonry-layout-css-grid/
//user_pref("layout.css.grid-template-masonry-value.enabled", true);
//user_pref("network.ssl_tokens_cache_capacity", 8192); // TLS token caching (fast reconnects)
/****************************************************************************
* SECTION: TAB UNLOAD *
@@ -441,7 +408,7 @@
// and use this percent value (out of 100) to determine if Firefox is in a
// low memory scenario.
// [1] https://dev.to/msugakov/taking-firefox-memory-usage-under-control-on-linux-4b02
//user_pref("browser.low_commit_space_threshold_percent", 20); // default=5; LINUX
//user_pref("browser.low_commit_space_threshold_percent", 5); // default=5; LINUX
// PREF: determine how long (in ms) tabs are inactive before they unload
// 60000=1min; 300000=5min; 600000=10min (default)