CSS Override With Global by Bartol

Adds a browser action to toggle applying CSS to pages.

About this extension

A Firefox extension for applying your own CSS to websites: per site, to every site at once, or just to the tab you're looking at.

Per-site styles. Styles are matched by exact hostname, so www.youtube.com and youtube.com are separate entries.
Global style. The Global (all sites) entry applies to every page. Site styles are applied after it, so they win when rules conflict.
Two strengths of CSS. Each entry has two boxes:
default: normal CSS that competes with the page's own styles by specificity, the same way the page's stylesheets do.
!important: injected as a user stylesheet. Declarations marked !important here beat everything the page does, including its own !important rules and inline styles. Declarations without !important lose to every page style, so mark each one.
Per-tab override. Turn a site's style on or off for one tab without changing it for the others.
Live updates. Saving a style updates open tabs right away, with no reload.
Synced. Styles are stored with Firefox Sync, so they follow you across devices when you're signed in.

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