/****************************************************************************************
 * Fastfox                                                                              *
 * "Non ducor duco"                                                                     *
 * priority: speedy browsing                                                            *
 * version: 108                                                                         *
 * url: https://github.com/yokoffing/Betterfox                                          *
 ***************************************************************************************/
 
// PREF: initial paint delay
// How long FF will wait before rendering the page, in milliseconds
// Reduce the 5ms Firefox waits to render the page
// [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1283302
// [2] https://docs.google.com/document/d/1BvCoZzk2_rNZx3u9ESPoFjSADRI0zIPeJRXFLwWXx_4/edit#heading=h.28ki6m8dg30z
user_pref("nglayout.initialpaint.delay", 0); // default=5; used to be 250
user_pref("nglayout.initialpaint.delay_in_oopif", 0); // default=5

// PREF: notification interval (in microseconds)
// When Firefox is loading a page, it periodically reformats
// or "reflows" the page as it loads. The page displays new elements
// every 0.12 seconds by default. These redraws increase the total page load time.
// Lowering the interval will decrease the perceived page load time
// but increase the total loading time.
// The notification interval has a dramatic effect on how long it takes to
// initially display content for slow connections. The default value
// provides good incremental display of content without causing an increase
// in page load time. If this value is set below 1/10 of a second it starts
// to impact page load performance.
// [1] https://searchfox.org/mozilla-central/rev/c1180ea13e73eb985a49b15c0d90e977a1aa919c/modules/libpref/init/StaticPrefList.yaml#1824-1834
user_pref("content.notify.interval", 360000); // (.36s), default=120000 (.12s)
    //user_pref("content.notify.ontimer", true); // DEFAULT

// PREF: set the minimum interval between session save operations
// Increasing this can help on older machines and some websites, as well as reducing writes
// [1] https://bugzilla.mozilla.org/1304389
//user_pref("browser.sessionstore.interval", 30000); // [DEFAULT: 15000]

// PREF: control how tabs are loaded when a session is restored
// true=Tabs are not loaded until they are selected (default)
// false=Tabs begin to load immediately.
//user_pref("browser.sessionstore.restore_on_demand", true); // DEFAULT
    //user_pref("browser.sessionstore.restore_pinned_tabs_on_demand", true);
//user_pref("browser.sessionstore.restore_tabs_lazily", true); // DEFAULT
    
// PREF: enable Lazy Image Loading
// https://www.ghacks.net/2020/02/15/firefox-75-gets-lazy-loading-support-for-images/
//user_pref("dom.image-lazy-loading.enabled", true); // DEFAULT

// PREF: disable preSkeletonUI on startup
user_pref("browser.startup.preXulSkeletonUI", false);

// PREF: OffscreenCanvas
// [1] https://yashints.dev/blog/2019/05/11/offscreen-canvas
// [2] https://www.youtube.com/watch?v=CWvRA9E0DqU
// [3] https://developer.chrome.com/blog/offscreen-canvas/
// [4] https://groups.google.com/a/mozilla.org/g/dev-platform/c/kp9SZL-0wW0
//user_pref("gfx.offscreencanvas.enabled", true); // DEFAULT FF106+

// PREF: CSS Font Loading API in workers
// [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1072107
//user_pref("layout.css.font-loading-api.workers.enabled", true); // DEFAULT FF106+

// PREF: enable importMaps [FF108+]
// [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1688879
// [2] https://github.com/WICG/import-maps#the-basic-idea
// [3] https://caniuse.com/import-maps
//user_pref("dom.importMaps.enabled", true); // DEFAULT FF108+
    //user_pref("javascript.options.experimental.import_assertions", true);
    
/****************************************************************************
 * SECTION: EXPERIMENTAL                                                    *
****************************************************************************/

// PREF: WebGPU [HIGHLY EXPERIMENTAL!] [NIGHTLY]
// [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1746245
// [2] https://github.com/gpuweb/gpuweb/wiki/Implementation-Status
// [3] https://hacks.mozilla.org/2020/04/experimental-webgpu-in-firefox/
// [4] https://developer.chrome.com/docs/web-platform/webgpu/
//user_pref("dom.webgpu.enabled", true);
    //user_pref("gfx.webgpu.force-enabled", true);

// PREF: about:home startup cache [NIGHTLY]
// A cache for the initial about:home document that is loaded by default at startup
// The purpose of the cache is to improve startup performance
//user_pref("browser.startup.homepage.abouthome_cache.enabled", true);

// PREF: CSS Masonry Layout [NIGHTLY]
user_pref("layout.css.grid-template-masonry-value.enabled", true);

// PREF: Prioritized Task Scheduling API [NIGHTLY]
// [1] https://blog.mozilla.org/performance/2022/06/02/prioritized-task-scheduling-api-is-prototyped-in-nightly/
// [2] https://medium.com/airbnb-engineering/building-a-faster-web-experience-with-the-posttask-scheduler-276b83454e91
user_pref("dom.enable_web_task_scheduling", true);

// PREF: enable CSS Animation Composition [NIGHTLY]
// [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1785329
// [2] https://bugzilla.mozilla.org/show_bug.cgi?id=1293490
// [3] https://developer.mozilla.org/en-US/docs/Web/CSS/animation-composition
user_pref("layout.css.animation-composition.enabled", true);

// PREF: Shadowrealms [NIGHTLY]
// [1] https://github.com/tc39/proposal-shadowrealm/blob/main/explainer.md#introduction
//user_pref("javascript.options.experimental.shadow_realms", true);

// PREF: Wasm GC + References [NIGHTLY]
// [1] https://github.com/WebAssembly/gc/blob/main/proposals/gc/Overview.md
// [2] https://github.com/WebAssembly/function-references/blob/master/proposals/function-references/Overview.md
//user_pref("javascript.options.wasm_gc", true);
//user_pref("javascript.options.wasm_function_references", true);

// PREF: Array.fromAsync [NIGHTLY]
// [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1795452
//user_pref("javascript.options.experimental.array_grouping", true);
//user_pref("javascript.options.experimental.enable_change_array_by_copy", true);

// PREF: not yet categorized / need documentation [NIGHTLY]
//user_pref("javascript.options.experimental.iterator_helpers", true);
//user_pref("javascript.options.experimental.weakrefs.expose_cleanupSome", true);

/****************************************************************************
 * SECTION: MAKE FIREFOX FAST                                               *
 * [NOTE] The following is not recommended for low-end machines             *
 * Credit for many of these:                                                *
 * https://gist.github.com/RubenKelevra/fd66c2f856d703260ecdf0379c4f59db    *
 * [NOTE] For best performance on older hardware, you will need to test     *
 * these settings individually.                                             *
****************************************************************************/

/****************************************************************************
 * SECTION: GFX RENDERING TWEAKS                                            *
****************************************************************************/

// PREF: Webrender tweaks
// [1] https://searchfox.org/mozilla-central/rev/6e6332bbd3dd6926acce3ce6d32664eab4f837e5/modules/libpref/init/StaticPrefList.yaml#6202-6219
// [2] https://hacks.mozilla.org/2017/10/the-whole-web-at-maximum-fps-how-webrender-gets-rid-of-jank/
// [3] https://www.troddit.com/r/firefox/comments/tbphok/is_setting_gfxwebrenderprecacheshaders_to_true/i0bxs2r/
// [4] https://www.troddit.com/r/firefox/comments/z5auzi/comment/ixw65gb?context=3
user_pref("gfx.webrender.all", true); // enables WR (GPU) + additional features
user_pref("gfx.webrender.precache-shaders", true);
user_pref("gfx.webrender.compositor", true);
    //user_pref("gfx.webrender.compositor.force-enabled", true); // reinforce
user_pref("layers.gpu-process.enabled", true);
    //user_pref("layers.gpu-process.force-enabled", true); // reinforce
user_pref("media.hardware-video-decoding.enabled", true);
    //user_pref("media.hardware-video-decoding.force-enabled", true); // reinforce

// PREF: if your hardware doesn't support Webrender, you can fallback to Webrender's software renderer
// [1] https://www.ghacks.net/2020/12/14/how-to-find-out-if-webrender-is-enabled-in-firefox-and-how-to-enable-it-if-it-is-not/
//user_pref("gfx.webrender.enabled", true);
//user_pref("gfx.webrender.software", true); // Webrender uses the CPU and not the GPU
    //user_pref("gfx.webrender.software.opengl", true); [LINUX]
    //user_pref("media.ffmpeg.vaapi.enabled", true); // [LINUX]

// PREF: GPU-accelerated Canvas2D tweaks
// [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1739448
user_pref("gfx.canvas.accelerated", true);
user_pref("gfx.canvas.accelerated.cache-items", 32768);
user_pref("gfx.canvas.accelerated.cache-size", 4096);
user_pref("gfx.content.skia-font-cache-size", 80);

// PREF: image tweaks
user_pref("image.cache.size", 10485760);
user_pref("image.mem.decode_bytes_at_a_time", 131072); // alt=65536; preferred=262144; chunk size for calls to the image decoders
user_pref("image.mem.shared.unmap.min_expiration_ms", 120000); // default=60000; minimum timeout to unmap shared surfaces since they have been last used

// PREF: increase media cache
user_pref("media.memory_cache_max_size", 1048576); // alt=512000; also in Securefox (inactive there)
user_pref("media.memory_caches_combined_limit_kb", 2560000); // preferred=3145728; // default=524288
    //user_pref("media.memory_caches_combined_limit_pc_sysmem", 20); // default=5

// PREF: decrease video buffering
// [NOTE] Does not affect YouTube since it uses DASH playback [1]
// [1] https://lifehacker.com/preload-entire-youtube-videos-by-disabling-dash-playbac-1186454034
//user_pref("media.cache_size", 2048000); // default=512000
user_pref("media.cache_readahead_limit", 9000); // default=60; stop reading ahead when our buffered data is this many seconds ahead of the current playback
user_pref("media.cache_resume_threshold", 6000); // default=30; when a network connection is suspended, don't resume it until the amount of buffered data falls below this threshold (in seconds)

// PREF: disable QUIC for faster upload speeds
// Firefox currently has a bug with impacting upload speeds with HTTP3
// [TEST] https://speedof.me/
// [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1753486
// [2] https://bugzilla.mozilla.org/show_bug.cgi?id=1596576
//user_pref("network.http.http3.enable", false); // disables HTTP3/QUIC
//user_pref("network.http.http2.chunk-size", 32000); // preferred=48000; default=16000 [needed?]

// PREF: disable AV1 for hardware decodeable videos
// AV1 uses software (CPU-based) decoding
// Firefox sometimes uses AV1 video decoding even to GPUs which do not support it
// [1] https://www.troddit.com/r/AV1/comments/s5xyph/youtube_av1_codec_have_worse_quality_than_old_vp9
//user_pref("media.av1.enabled", false);

/****************************************************************************
 * SECTION: BROWSER CACHE                                                   *
****************************************************************************/

// PREF: disk cache
// [EXTENSION] https://addons.mozilla.org/en-US/firefox/addon/cache-longer/
//user_pref("browser.cache.disk.enable", true); // overrides Securefox
//user_pref("browser.cache.disk.max_entry_size", 51200); // DEFAULT
//user_pref("browser.cache.disk.smart_size.enabled", false); // disable adaptive cache size on disk
//user_pref("browser.cache.disk.capacity", 8192000); // 8 GB cache on disk
//user_pref("browser.cache.max_shutdown_io_lag", 16); // number of seconds the cache spends writing pending data and closing files after shutdown has been signalled
//user_pref("browser.cache.frecency_half_life_hours", 128); // lower cache sweep intervals, the half life used to re-compute cache entries frecency (in hours)

// PREF: increase memory cache size
// [1] https://www.makeuseof.com/tag/how-much-data-does-youtube-use/
user_pref("browser.cache.memory.capacity", -1); // enforce DEFAULT; 256000=256MB, 512000=512MB, 1024000=1GB, 2097152=2GB, 5242880=5GB, 8388608=8GB
user_pref("browser.cache.memory.max_entry_size", 153600); // alt=51200; preferred=327680 ; -1 -> entries bigger than than 90% of the mem-cache are never cached

/****************************************************************************
 * SECTION: NETWORK                                                         *
****************************************************************************/

// PREF: use bigger packets
// [1] https://www.mail-archive.com/support-seamonkey@lists.mozilla.org/msg74561.html
// [2] https://www.mail-archive.com/support-seamonkey@lists.mozilla.org/msg74570.html
user_pref("network.buffer.cache.size", 262144); // preferred=327680; default=32768
user_pref("network.buffer.cache.count", 128); // preferred=240; default=24

// 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
//user_pref("network.http.max-connections", 1800); // default=900
//user_pref("network.http.max-persistent-connections-per-server", 9); // default=6; download connections; anything above 10 is excessive
//user_pref("network.http.max-persistent-connections-per-proxy", 48); // default=32
//user_pref("network.http.max-urgent-start-excessive-connections-per-host", 6); // default=3
//user_pref("network.http.pacing.requests.min-parallelism", 18); // default=6

// PREF: increase DNS cache
user_pref("network.dnsCacheEntries", 20000);	
user_pref("network.dnsCacheExpiration", 3600);	// keep entries for 1 hour
user_pref("network.dnsCacheExpirationGracePeriod", 240);

// PREF: increase TLS token caching 
user_pref("network.ssl_tokens_cache_capacity", 32768); // default=2048; faster SSL (fast reconnects)

// These do not help speed:
// PREF: DoH requests
//user_pref("network.trr.request_timeout_ms", 800); // default=1500
    //user_pref("network.trr.retry-timeout-ms", 125); // DEFAULT
//user_pref("network.trr.request_timeout_mode_trronly_ms", 15000); // default=30000
// PREF: close a connection if tls handshake does not finish in given number of seconds
//user_pref("network.http.tls-handshake-timeout", 20); // default=30
// PREF: timeout connections if an initial response is not received in number of seconds
//user_pref("network.http.response.timeout", 200); // default=300

/****************************************************************************
 * SECTION: SPECULATIVE CONNECTIONS                                         *
****************************************************************************/

// [NOTE] FF85+ partitions (isolates) pooled connections, prefetch connections,
// pre-connect connections, speculative connections, TLS session identifiers,
// and other connections. We can take advantage of the speed of pre-connections
// while preserving privacy. Users may relax hardening to maximize their preference.
// For more information, see SecureFox: "PREF: State Paritioning" and "PREF: Network Partitioning" [1]
// [1] https://github.com/yokoffing/Betterfox/blob/e9621b0062914da5fdb5f83b8da64041965b7a50/Securefox.js#L74-L108
// [NOTE] To activate and increase network predictions, go to settings in uBlock Origin,  and make this setting is DISABLED:
// - "Disable pre-fetching (to prevent any connection for blocked network requests)"
// [NOTE] Add prefs to "MY OVERRIDES" section and uncomment to enable them in your user.js.

// PREF: increase network predictions
//user_pref("network.http.speculative-parallel-limit", 18); // default=6; overrides SecureFox
//user_pref("network.dns.disablePrefetch", false); // overrides SecureFox
//user_pref("network.dns.disablePrefetchFromHTTPS", false);
//user_pref("browser.urlbar.speculativeConnect.enabled", true); // overrides SecureFox
//user_pref("browser.places.speculativeConnect.enabled", true); // overrides SecureFox
//user_pref("network.prefetch-next", true); // overrides SecureFox
//user_pref("network.predictor.enabled", true); // overrides SecureFox
//user_pref("network.predictor.enable-prefetch", true); // overrides SecureFox
//user_pref("network.predictor.enable-hover-on-ssl", true);
    //user_pref("network.predictor.preresolve-min-confidence", 10); // default=60; alt=40
    //user_pref("network.predictor.preconnect-min-confidence", 20); // default=90; alt=70
    //user_pref("network.predictor.prefetch-min-confidence", 30); // default=100; alt=80
        //user_pref("network.predictor.prefetch-force-valid-for", 3600); // default=10
        //user_pref("network.predictor.prefetch-rolling-load-count", 120); // default=10
    //user_pref("network.predictor.max-resources-per-entry", 250); // default=100
    //user_pref("network.predictor.max-uri-length", 1000); // default=500