A Firefox (and Firefox forks) plugin, which highlights tabs if you hover over links you already have open. This helps quickly finding out if you already opened a link, for example if you have multiple YouTube videos open.
The extension is available on the Mozilla addon page. Here is the link to TabLight.
Hovering over a YouTube video link highlights the already open tab.
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Hovering over a YouTube video link highlights the already open tab.
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After cloning the repo, enter about:debugging in Firefox and click This Firefox and
Load Temporary Add-on..., select any file (like manifest.json) from the tablight folder.