Container In Title

ResolveIT

Modifies the Firefox window title to prepend the current tab's container, if it exists. For filtering/categorizing in time-tracking software, among other things

Screenshots from Mozilla Add-ons

Discovery

SponsorBlock - Skip Sponsorships on YouTube

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Enhancer for YouTube™

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Tab Session Manager

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Unhook: Remove YouTube Recommended Videos Comments

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Tree Style Tab

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Immersive Translate -Translate Website, PDF, Video

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