To use these add-ons, you'll need to download Firefox.

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Iceggiren i Load Progress Bar

Load Progress Bar sɣur Luben Karavelov

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Tiririt sɣur Luben Karavelov

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Yes, the web-ext API is pretty limited in terms of modifying the UI . This is what's supported at the moment: https://developer.mozilla.org/en-US/Add-ons/WebExtensions/user_interface