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One of the reasons I use Mozilla Firefox is its huge universe of extensions, scripts, styles, and other add-ons which can make it behave the way you want it to. I've customized my Firefox installation pretty extensively.

This list is current as of Firefox 62.0.

Extensions

Extensions not available on Firefox Add-ons:

• Bypass Paywalls for Firefox

• fx_cast: Google Cast implementation for Firefox. Needs browser extension plus OS binary

Preferences

user.js settings I use:

Experimental settings:

None in use.

Chrome

Contents of my userChrome.css:

   1 /* Font preferences for AwesomeBar dropdown
   2  * 
   3  * Adjusts font size, underlines URLs, and corrects colors
   4  */
   5 .ac-comment
   6 {
   7   font-size: 100% !important;
   8 }
   9 
  10 .ac-url-text
  11 {
  12   color: #306090 !important;
  13   text-decoration: underline !important;
  14 }
  15 
  16 .ac-url-text[selected="true"]
  17 {
  18   color: white !important;
  19 }
  20 
  21 /* Use monospaced font for AwesomeBar */
  22 #urlbar
  23 {
  24   font-family: monospace !important;
  25   font-size: 14px !important;
  26 }
  27 
  28 /* Combines Stop/Reload buttons, such that only one is shown at a time
  29  *
  30  * Note: May require button reordering (e.g reverse order of stop/reload
  31  * buttons) if the below does not work
  32  *
  33  * Derived from user style: http://userstyles.org/styles/10
  34  * Also, see bug 343396: https://bugzilla.mozilla.org/show_bug.cgi?query_format=specific&order=relevance+desc&bug_status=__open__&id=343396
  35  */
  36 #stop-button[disabled="true"] { display:none; } 
  37 #stop-button:not([disabled]) + #reload-button { display:none; }
  38 
  39 /* Italicize unread tabs
  40  *
  41  * Derived from user style: http://userstyles.org/styles/8247
  42  */
  43 #content tab:not([selected]) { font-style: italic !important; }
  44 
  45 /* Display keyword field in Bookmark dialog
  46  *
  47  * Derived from user style: http://userstyles.org/styles/8250
  48  */
  49 #editBMPanel_keywordRow { visibility: visible; }
  50 
  51 /* Hide search and go buttons */
  52 .search-go-button,
  53 .search-go-button-stack,
  54 #go-button
  55 {
  56   display: none !important;
  57 }

Android

Using Roboto or another font instead of Open Sans

1. Go to about:config
2. Set to "Roboto", "Nokia Pure Text", or "Alte Haas Grotesk"
   • font.name.sans-serif.x-unicode
   • font.name.sans-serif.x-user-def
   • font.name.sans-serif.x-western

Font size adjustments

1. Go to about:config
2. Set font.minimum-size.x-unicode and font.minimum-size.x-western to 14
3. Set font.size.inflation.minTwips to "140"

Cache location

On devices w/ 8–16 GB memory, store Firefox's cache on the external SD card:

1. Go to about:config
2. Set browser.cache.disk.parent_directory to one of:
   • /storage/sdcard1/Android/data/org.mozilla.fennec/files/cache/
   • /storage/sdcard1/Android/data/org.mozilla.firefox_beta/files/cache/
   • /storage/sdcard1/Android/data/org.mozilla.firefox/files/cache/

Enabling off-main-thread compositing

Set to true:

• layers.acceleration.force-enabled
• gfx.canvas.azure.accelerated
• layers.omtp.enabled

You can also set:

• layers.acceleration.draw-fps

to display a FPS counter in the top left corner. If you see the counter, than OMTC and layer acceleration are working.

722012 – [Meta] Implement OMTC on Linux tracks whether OMTC has been enabled on Linux.

Fiddling

To tinker w/ browser styles/events/etc, navigate to chrome://browser/content/browser.xul and launch the built-in developer tools.

External tools

https://gist.github.com/f1u77y/715f0dd03fc18039a6549de557370b97: Exports styles from Stylish extension (stored in stylish.sqlite) into a JSON file that can be loaded into Stylus.

KDE integration

Legacy stuff:

• mozilla-kde.patch upstream

• openSUSE/kmozillahelper: kmozillahelper for showing file dialogs, etc. Needs mozilla-kde.patch

• Plasma Integration Firefox Add-on along with plasma-browser-integration (available in most Linux distributions)

In Firefox 64 and 2019-vintage Linux distributions, can also use "desktop portal" support.

• xdg-desktop-portal and xdg-desktop-portal-kde packages

• Set environment variable GTK_USE_PORTAL=1 for firefox.desktop (or globally once crash in Thunderbird is fixed):

cp /usr/share/applications/firefox.desktop ~/.local/share/applications/
kwriteconfig5 --file=$HOME/.local/share/applications/firefox.desktop --group="Desktop Entry" "Exec" "GTK_USE_PORTAL=1 /usr/lib/firefox/firefox %u"
kwriteconfig5 --file=$HOME/.local/share/applications/firefox.desktop --group="Desktop Action new-private-window" "Exec" "GTK_USE_PORTAL=1 /usr/lib/firefox/firefox %u"
kwriteconfig5 --file=$HOME/.local/share/applications/firefox.desktop --group="Desktop Action new-window" "Exec" "GTK_USE_PORTAL=1 /usr/lib/firefox/firefox %u"
kbuildsycoca5

Containers

Firefox extensions

• Multi-Account Containers: official extension from Mozilla. Functional but lacking.
• Containers with Transitions: fork the above? Unclear if still maintained.

• Containerise: Lets you specify lists of sites that should live in containers. See containerise-lists.

• Temporary Containers

Most recommend Containerize and Temporary Containers.

Interesting reading

• How to remove zoom level indicator from URL bar? : firefox

• Is there any way to "turn off" the zoom indicator in 51? : firefox

• How can I add the CSS styles used by Firefox reader mode?

• https://www.userchrome.org/

• https://github.com/overdodactyl/ShadowFox

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