https://madprops.github.io/grasshopper/

Grasshopper is a Firefox extension for tab management. It has 4 item
modes: Tabs, Stars, Closed, and History. Tabs display all your open
tabs, and you can interact with them. Tabs are orded by last visit
date. Your freshest tabs are always at the top. And if there are too
many, you can type to find it. Stars are like bookmarks that you save
manually. Stars can be used to open websites easily. Closed are
recently closed tabs. History searches and filters browser history.
Firefox Store Link Github Repo Link
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There's a Settings window with various options.
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The background and text colors can be customized. Random dark and
light themes can be generated.
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There's useful buttons like "Playing" and "Clean". "Playing" focuses
the tab that is emitting sound. So you can return easily to what you
were watching or listening to. "Clean" closes all the tabs which are
not pins or playing. So if you have many tabs open, you can hit
"Clean" and keep only the important ones. One way to find items
quickly is typing something and if doesn't appear hit [Tab] to search
in Stars. The [Tab] order can be customized in Settings.
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Items can be filtered by type. Like if they're pinned, playing audio,
muted, etc. Secure = https websites Insecure = http websites