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How to stop content text size and image size change randomly during usage

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As I'm browsing web sites text size changes randomly as do images...They can be changed back to readable size but how do I stop them from changing randomly. I've tried desensitizing touchpad settings.

As I'm browsing web sites text size changes randomly as do images...They can be changed back to readable size but how do I stop them from changing randomly. I've tried desensitizing touchpad settings.

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Hi, please give this a try : uninstall Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files , C:\Program Files(x86) & C:\ProgramData Then restart system. Then run Windows Disk Cleanup. (Note: This should be Pinned and run Weekly, If never done below expect 10's of gig's) Then run it again and click the button that says Cleanup System Files. Note: your Firefox Profile is saved. But you should make a back up before you do :

Reinstall with Current Release Firefox 61.0.1 with a Full Version Installer

Please let us know if this solved your issue or if need further assistance.

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You may have accidentally zoomed web page(s). Reset the page zoom on pages that cause problems.

  • View -> Zoom -> Reset (Ctrl+0/Command+0 (zero))

Try to rename/remove content-prefs.sqlite in the Firefox profile folder with Firefox closed. That will remove site specific settings. If you would clear the Site Preferences then you will also lose all exceptions.

  • clearing "Site Preferences" clears exceptions for cookies, images, pop-up windows, and software installation and exception for password and other website specific data

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.