Tab Preview On Hover (Discontinued)

This add-on adds on-hover tab preview to Firefox (requires CSS theme).

Note: This add-on is now discontinued as Mozilla has since integrated tab preview functionality directly into Firefox.

What Does the Add-on & CSS Theme Do?

With the add-on and the supporting CSS theme, a tab preview will appear when a tab is hovered over.

There will be a short delay before the tab preview appears. If the cursor moves from one tab to another, there will be no delay. However, if the cursor leaves the tab area for a brief moment and then returns, the delay will reappear. This behaviour can be controlled via the CSS theme. Users can modify the following variables to adjust the timing:

• --preview-delay
• --preview-delay-tolerance

How to Install the CSS Theme

1. Go to about:support and locate the Profile Folder.
2. Download the CSS theme and move it into Profile Folder -> chrome.
3. Go to about:config and set toolkit.legacyUserProfileCustomizations.stylesheets to true.
4. Restart Firefox.

Compromises

1. The background image for the browser navbar will be disabled.
2. Incompatible with the built-in browser themes “System theme – auto” and “Firefox Alpenglow”.
3. Only the first ten tabs on the left will have tab previews.
4. Adaptive Tab Bar Colour may cause the tab preview to disappear at times, as it resets the browser theme whenever it changes the tab bar colour.