The Wiki contains a feature list (with screenshots).
about:config
> toolkit.legacyUserProfileCustomizations.stylesheets
> true
Settings/Options
> Advanced
> General
> Config Editor...
toolkit.legacyUserProfileCustomizations.stylesheets
> true
Based on this project by ardiman: https://github.com/ardiman/userChrome.js
Additionally based on the modified files by Endor8: https://github.com/Endor8/userChrome.js/
Copy from this projects \script_loader\profile\
folder userChrome
folder and userChrome.js
file to \ PROFILENAME \chrome\
folder.
Copy from this projects \script_loader\firefox\
folder defaults
folder and config.js
file into Firefox main directory (where the Firefox executable is; or on macOS, inside the main executable, at /Applications/Firefox.app/Contents/Resources/
).
Edit userChrome.js
file to add custom scripts!
With Firefox 62+ and Thunderbird 68+ an additional preference pref("general.config.sandbox_enabled", false);
has to be set inside config-prefs.js
file. This is considered less secure by Mozilla and is only a temporary workaround, but at the moment it is the only way to run custom scripts using "method 2".
Where to find Firefox startupCache
folder?
about:profiles > Local Directory > Open Folder
, close Firefox and delete all files in startupCache
folder.
This is not the same 'profile' folder custom scripts and styles are stored in!
Where to find Thunderbird startupCache
folder?
Windows
C:\Users\ USERNAME \AppData\Local\Mozilla\Thunderbird\Profiles\ PROFILE FOLDER NAME \
Linux/macOS
Search for startupCache
folder on your hard drive.
More info about startup cache removal (in German): https://github.com/ardiman/userChrome.js/wiki/Skriptcache
about:support > Application Binary
(Path on your system)
about:profiles > Root Directory > Open Folder
or
about:support > Profile Folder > Open Folder
Windows
C:\Users\ USERNAME \AppData\Roaming\Mozilla\Thunderbird\Profiles\ PROFILE FOLDER NAME \
Hidden files must be visible to see AppData
folder. Alternatively open %APPDATA%\Mozilla\Firefox\Profiles\
from explorers location bar.
Linux
/home/ username /.mozilla/thunderbird/ profile folder name /
Hidden files must be visible to see .mozilla
folder.
Mac OS X
~\Library\Mozilla\Thunderbird\Profiles\ PROFILE FOLDER NAME \
or
~\Library\Application Support\Mozilla\Thunderbird\Profiles\ PROFILE FOLDER NAME \
\Users\ USERNAME \Library\Application\Support\Thunderbird\Profiles\
Script collection by ardiman: https://github.com/ardiman/userChrome.js Script collection by Endor8: https://github.com/Endor8/userChrome.js Script collection by xiaoxiaoflood: https://github.com/xiaoxiaoflood/firefox-scripts/tree/master/chrome