Hello,

Try disabling graphics hardware acceleration. Since this feature was added to Firefox, it has gradually improved, but there still are a few glitches.

You might need to restart Firefox in order for this to take effect, so save all work first (e.g., mail you are composing, online documents you're editing, etc.).

Then perform these steps:

• Click the orange Firefox button at the top left, then select the "Options" button, or, if there is no Firefox button at the top, go to Tools > Options.
• In the Firefox options window click the Advanced tab, then select "General".
• In the settings list, you should find the Use hardware acceleration when available checkbox. Uncheck this checkbox.
• Now, restart Firefox and see if the problems persist.

Additionally, please check for updates for your graphics driver by following the steps mentioned in the following Knowledge base articles:

Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

Upgrade your graphics drivers to use hardware acceleration and WebGL

Did this fix your problems? Please report back to us!

Thank you.

Hello,

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.

Hi,

Thanks for the reply and I'm sorry for taking so long to report back. Quite busy at work..

I tried disabling hardware acceleration but to no avail. The zooming out/in happened a while after. Now restarted Firefox in safe mode and will give it another go. Sometimes it's difficult to reproduce. Will report back on how it went. Thanks again for the reply.

Nope.. Firefox in safe mode doesn't fix it either.

Hello,

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.

I have 4 different Mac machines all using Logitech Anywhere mouse and they are all experiencing this same issue and only in Firefox. I also use 1 PC with same mouse and Firefox without issue. I have up to date versions of OSX 10.6.8, Firefox and Setpoint. Please try and figure something out. This is the first time I have considered leaving Firefox for Chrome or Safari.. Have to continually go to View-Zoom-Reset

Did you check the settings of those buttons in the mouse settings to check which codes get sended, assuming that Logitech also provides special settings on Mac like it does on Windows?

Tried all that, thanks. The settings in Setpoint are not as extensive on the Mac side as they are on Windows. But until the latest version of Firefox everything worked fine. And do work fine in every other browser.

Try to set the mousewheel.withcontrol.action pref to 1 on the about:config page to avoid zooming the page.

• http://kb.mozillazine.org/about:config

Same problem in version 21

I've got a solution for you, but it will disable zooming. Set zoom.minPercent and zoom.maxPercent to 100. It disables all zooming, but it fixes the problem.

The mouse configuration remains the same as it was. This issue was only detected after I updated and started using Firefox 20. The mouse back button worked fine with those settings in previous versions so no changes were made. Sure, I could revert to Firefox 19 or older but that kind of defeats the purpose of new Firefox builds. Because I am professionally involved in the software development business, I am aware that bugs are bound to be found ( or else I would be out of a job) but in an increasingly competitive browser 'war', this is the first time I have considered changing browser since I started using Firefox in 2002/3.

Was there an actual solution or fix noted here that I missed? Neither Firefox, OSX or Setpoint have a setting adjustment for zoom that I have found. And disabling a standard mouse feature to resolve a browser issue is hardly a resolution.