Try updating to Firefox 23, does it work there? Update Firefox to the latest release

Tried it, thanks for the suggestion, but still no luck.

Hello,

note that to scroll through tabs with mouse wheel, you can position the mouse cursor, between the two arrows at each end, of the row of tabs. That means that you have quite a few tabs to see the arrows at each end.

otherwise, Try Firefox Safe Mode to see if the problem goes away. Safe Mode is a troubleshooting mode, which disables most add-ons.

(If you're not using it, switch to the Default theme.)

• You can open Firefox 4.0+ in Safe Mode by holding the Shift key when you open the Firefox desktop or Start menu shortcut.
• Or open the Help menu and click on the Restart with Add-ons Disabled... menu item while Firefox is running.

Once you get the pop-up, just select "'Start in Safe Mode"

If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension, and you need to figure out which one. Please follow the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article for that.

To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.

When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.

Thank you.

Yes, tried this and disabling hardware acceleration too, no luck =/

Note that you can double-click a scroll button to move the tabs one screen or triple-click a scroll button to go to the begin (first tab) or end (last tab).

Unfortunately I use many, many tabs and the mousewheel is (was) far and away the easiest method to navigate them.

Does no one have any idea why mouse wheel scrolling tabs wouldn't even work in safe mode?

Does it help if the browser window isn't maximized or the tab bar isn't in the title bar (browser.tabs.drawInTitlebar = false)?

Thanks for the response, neither of these things made a difference, even if paired with Safe Mode =/