Mozilla has released a long-requested feature for its browser. Now, Firefox users testing early updates in the Nightly Channel can try tab previews when hovering the cursor over tabs.
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.
I also didn't have a need for it and wanted to disable it and I found browser.tabs.hoverPreview.enabled in about: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)