UserChromeFiles

For use in Firefox ^Desktop
and Thunderbird ^Desktop

UserChromeFiles is a script/style loader that extends the capabilities of Firefox and Thunderbird using the autoconfig feature.

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CustomScripts

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FullTheme

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Webextensions

For use in Firefox ^Desktop

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Experiments and Themes

For use in Developer Edition ^Desktop (recommended)
or Extended Support Release ^Desktop (recommended)
or Nightly ^Desktop