Update user.js

// SECUREFOX
Add new section "Various" to correspond to SecureFox prefs:
user_pref("dom.targetBlankNoOpener.enabled", true);
user_pref("pdfjs.disabled", false);
user_pref("privacy.window.name.update.enabled", true);
user_pref("security.pki.crlite_mode", 2);
user_pref("security.remote_settings.crlite_filters.enabled", true);

Others added:
user_pref("dom.security.https_only_mode_send_http_background_request", false);
user_pref("dom.storage.next_gen", true);
user_pref("security.mixed_content.block_object_subrequest", true);

// PESKYFOX
*Subtitles are now consistent with Peskyfox.js.
*Fixed disable pocket

added:
user_pref("browser.startup.page", 3);
user_pref("browser.messaging-system.whatsNewPanel.enabled", false);
user_pref("extensions.formautofill.creditCards.available", false);
user_pref("browser.urlbar.suggest.engines", false);

Moved and enabled from Dev/Nightly prefs:
user_pref("image.avif.enabled", true);

user.js

@@ -2,7 +2,7 @@
 /****************************************************************************
  * BetterFox                                                                *
  * name: yokoffing user.js                                                  *
- * version: 09 January 2021                                                 *
+ * version: 16 January 2021                                                 *
  * url: https://github.com/yokoffing/Better-Fox                             *
  * license: https://github.com/yokoffing/Better-Fox/blob/master/LICENSE     *
  * README: https://github.com/yokoffing/Better-Fox/blob/master/README.md    *
@@ -18,6 +18,7 @@ user_pref("full-screen-api.transition-duration.enter", "0 0");
 user_pref("full-screen-api.transition-duration.leave", "0 0");
 user_pref("dom.image-lazy-loading.enabled", true);
 
+
 /****************************************************************************
  * START: SECUREFOX                                                         *
 ****************************************************************************/
@@ -37,6 +38,7 @@ user_pref("privacy.purge_trackers.enabled", true);
 user_pref("browser.cache.offline.enable", false);
 user_pref("browser.cache.cache_isolation", true);
 user_pref("privacy.partition.network_state", true);
+user_pref("dom.storage.next_gen", true);
 
 /*** PRELOADING ***/
 user_pref("network.dns.disablePrefetch", true);
@@ -58,8 +60,11 @@ user_pref("browser.search.suggest.enabled.private", false);
 user_pref("browser.fixup.alternate.enabled", false);
 user_pref("security.insecure_connection_text.enabled", true);
 user_pref("network.IDN_show_punycode", true);
+
+/*** HTTPS-ONLY MODE ***/
 user_pref("dom.security.https_only_mode", true);
 user_pref("dom.security.https_only_mode_ever_enabled", true);
+user_pref("dom.security.https_only_mode_send_http_background_request", false);
 
 /***PASSWORDS AND AUTOFILL***/
 user_pref("signon.management.page.breach-alerts.enabled", true);
@@ -85,6 +90,14 @@ user_pref("signon.generation.enabled", false);
 /*** MIXED CONTENT ***/
 user_pref("security.mixed_content.block_active_content", true);
 user_pref("security.mixed_content.upgrade_display_content", true);
+user_pref("security.mixed_content.block_object_subrequest", true);
+
+/*** VARIOUS ***/
+user_pref("dom.targetBlankNoOpener.enabled", true);
+user_pref("pdfjs.disabled", false);
+user_pref("privacy.window.name.update.enabled", true);
+user_pref("security.pki.crlite_mode", 2);
+user_pref("security.remote_settings.crlite_filters.enabled", true);
 
 /***GOOGLE SAFE BROWSING***/
 /* Be sure to have alternate security measures if you disable Safebrowsing! */
@@ -119,7 +132,6 @@ user_pref("toolkit.telemetry.updatePing.enabled", false);
 user_pref("toolkit.telemetry.bhrPing.enabled", false);
 user_pref("toolkit.telemetry.firstShutdownPing.enabled", false);
 user_pref("toolkit.telemetry.coverage.opt-out", true);
-user_pref("toolkit.coverage.opt-out", true);
 user_pref("toolkit.coverage.endpoint.base", "");
 user_pref("app.shield.optoutstudies.enabled", false);
 user_pref("browser.discovery.enabled", false);
@@ -129,18 +141,16 @@ user_pref("datareporting.policy.dataSubmissionEnabled", false);
 user_pref("datareporting.healthreport.uploadEnabled", false);
 user_pref("browser.ping-centre.telemetry", false);
 
+
 /****************************************************************************
  * START: PESKYFOX                                                          *
 ****************************************************************************/
 
-/*** FOR USERCHROME ***/
+/*** NEW TAB PAGE ***/
 user_pref("toolkit.legacyUserProfileCustomizations.stylesheets", true);
-
+user_pref("browser.startup.page", 3);
-/*** EXTENSION RECOMMENDATIONS ***/
 user_pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr.addons", false);
 user_pref("browser.newtabpage.activity-stream.asrouter.userprefs.cfr.features", false);
-
-/*** ACTIVITY STREAM ON NTP ***/
 user_pref("browser.newtabpage.activity-stream.showSponsored", false);
 user_pref("browser.newtabpage.activity-stream.showSponsoredTopSites", false);
 user_pref("browser.newtabpage.activity-stream.feeds.section.topstories", false);
@@ -151,13 +161,28 @@ user_pref("browser.newtabpage.activity-stream.section.highlights.includeBookmark
 user_pref("browser.newtabpage.activity-stream.section.highlights.includeDownloads", false);
 user_pref("browser.newtabpage.activity-stream.section.highlights.includePocket", false);
 user_pref("browser.newtabpage.activity-stream.section.highlights.includeVisited", false);
+user_pref("browser.messaging-system.whatsNewPanel.enabled", false);
 
 /*** POCKET ***/
-user_pref("browser.pocket.enabled", false);
+user_pref("extensions.pocket.enabled", false);
 
-/***DISABLE AUTOFILL***/
+/*** DOWNLOADS ***/
+user_pref("browser.download.useDownloadDir", true);
+user_pref("browser.download.manager.addToRecentDocs", false);
+user_pref("browser.download.hide_plugins_without_extensions", false);
+
+/*** WARNINGS ***/
+user_pref("browser.tabs.warnOnClose", false);
+user_pref("browser.tabs.warnOnCloseOtherTabs", false);
+user_pref("browser.tabs.warnOnOpen", false);
+user_pref("full-screen-api.warning.delay", -1);
+user_pref("full-screen-api.warning.timeout", -1);
+user_pref("browser.aboutConfig.showWarning", false);
+
+/*** AUTOFILL ***/
 user_pref("extensions.formautofill.addresses.enabled", false);
 user_pref("extensions.formautofill.available", "off");
+user_pref("extensions.formautofill.creditCards.available", false);
 user_pref("extensions.formautofill.creditCards.enabled", false);
 user_pref("extensions.formautofill.heuristics.enabled", false);
 user_pref("browser.formfill.enable", false);
@@ -165,20 +190,8 @@ user_pref("signon.autofillForms", false);
 user_pref("signon.rememberSignons", false);
 user_pref("signon.formlessCapture.enabled", false);
 
-/***OTHER***/
+/*** ANNOYANCES ***/
-user_pref("accessibility.force_disabled", 1);
+user_pref("browser.urlbar.suggest.engines", false);
-user_pref("browser.bookmarks.max_backups", 2);
-user_pref("browser.display.show_image_placeholders", true);
-user_pref("browser.download.folderList", 0);
-user_pref("browser.download.manager.addToRecentDocs", false);
-user_pref("browser.startup.page", 3);
-user_pref("browser.tabs.warnOnClose", false);
-user_pref("browser.tabs.warnOnCloseOtherTabs", false);
-user_pref("browser.tabs.warnOnOpen", false);
-user_pref("full-screen-api.warning.delay", -1);
-user_pref("full-screen-api.warning.timeout", -1);
-user_pref("browser.aboutConfig.showWarning", false);
-user_pref("browser.urlbar.suggest.topsites", false);
 user_pref("browser.shell.checkDefaultBrowser", false);
 user_pref("permissions.default.desktop-notification", 2);
 user_pref("media.autoplay.default", 5);
@@ -187,21 +200,28 @@ user_pref("browser.backspace_action", 2);
 user_pref("ui.key.menuAccessKey", 0);
 user_pref("findbar.highlightAll", true);
 user_pref("layout.spellcheckDefault", 2);
+user_pref("accessibility.force_disabled", 1);
+user_pref("browser.bookmarks.max_backups", 2);
+user_pref("browser.display.show_image_placeholders", true);
 user_pref("view_source.wrap_long_lines", true);
 user_pref("devtools.debugger.ui.editor-wrapping", true);
+
+/*** TAB BEHAVIOR ***/
+user_pref("browser.sessionstore.restore_on_demand", true);
 user_pref("browser.link.open_newwindow", 3);
 user_pref("browser.link.open_newwindow.restriction", 0);
 user_pref("browser.tabs.closeWindowWithLastTab", false);
+user_pref("browser.bookmarks.openInTabClosesMenu", false);
 user_pref("browser.tabs.loadBookmarksInBackground", true);
 user_pref("browser.tabs.loadBookmarksInTabs", true);
-user_pref("browser.bookmarks.openInTabClosesMenu", false);
+user_pref("image.avif.enabled", true);
+user_pref("browser.helperApps.showOpenOptionForPdfJS", true); 
 user_pref("editor.truncate_user_pastes", false);
-user_pref("gfx.webrender.quality.force-subpixel-aa-where-possible", true);
-user_pref("media.videocontrols.picture-in-picture.video-toggle.always-show", true);
 user_pref("clipboard.plainTextOnly", true);
 user_pref("dom.disable_window_move_resize", true);
 user_pref("dom.popup_allowed_events", "click dblclick");
 
+
 /****************************************************************************
  * START: DEV / NIGHTLY PREFS                                                 *
 ****************************************************************************/
@@ -212,7 +232,6 @@ user_pref("dom.popup_allowed_events", "click dblclick");
 // user_pref("layout.css.grid-template-masonry-value.enabled", true);
 // user_pref("layout.css.constructable-stylesheets.enabled", true);
 // user_pref("javascript.options.warp", true);
-// user_pref("image.avif.enabled", true);
 // user_pref("dom.input_events.beforeinput.enabled", true);
 // user_pref("dom.forms.inputmode", true);