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apply-css

This add-on injects CSS into web pages. The addons.mozilla.org domain disallows this operation, so this add-on will not work properly when it's run on pages in the addons.mozilla.org domain.

What it does

This extension includes:

  • a background script, "background.js"
  • a page action

It adds the page action to every tab the user opens. Clicking the page action for a tab applies some CSS using tabs.insertCSS.

Clicking again removes the CSS using tabs.removeCSS.

What it shows

  • some basic page action functions
  • how to apply and remove CSS.