Firefox Nightly, a special channel where users can try out the latest features and changes, received a new feature that should make life easier for tab hoarders: tab previews. You can now hover the cursor over a tab and get a thumbnail with what is happening in that tab.
It can be 👍
I also didn’t have a need for it and wanted to disable it and I found
browser.tabs.hoverPreview.enabled
inabout:config
(set it to false to disable).There’s also
browser.tabs.hoverPreview.showThumbnails
to only disable the image preview but not the new layout of the tooltip (there’s also a corresponding option for it in the main settings)