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What happens if I uninstall and reinstall Firefox

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  • 1 has this problem
  • 26 views
  • Last reply by Dropa

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Firefox is just not working for me. It's not reading the stylesheets on my website, tabs are disappearing but the websites are still open. It seems the installation may have become corrupt. If I uninstall and reinstall what data will I lose if any?

Firefox is just not working for me. It's not reading the stylesheets on my website, tabs are disappearing but the websites are still open. It seems the installation may have become corrupt. If I uninstall and reinstall what data will I lose if any?

All Replies (7)

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Let’s do a full clean re-install;

Note: Firefox comes in three or more folders on all computers. They are;

Maintenance: (Programs Folder) <Windows Only> Firefox itself: (Programs Folder) And two folders in the profile of each user on the computer for each Firefox profile for that user.

If you remove the Firefox program folder, the user profiles would not be affected.


Download Firefox For All languages And Systems {web link}

Firefox ESR; Extended Support Release {web link}

Beta, Developer, Nightly versions https://www.mozilla.org/en-US/firefox/channel/desktop/

Install Older Version Of Firefox {web link} Be sure to read everything here.


Download and save the program you want. Then Close Firefox.

Using your file browser, open the Programs Folder on your computer.

Windows: C:\Program Files C:\Program Files (x86) Note: Check Both Folders

Mac: Open the "Applications" folder. https://support.mozilla.org/en-US/kb/how-download-and-install-firefox-mac

Linux: Check your user manual. If you installed Firefox with the distro-based package manager, you should use the same way to uninstall it. See Install Firefox on Linux; https://support.mozilla.org/en-US/kb/install-firefox-linux

If you downloaded and installed the binary package from the Firefox download page, simply remove the folder Firefox in your home directory. http://www.mozilla.org/firefox#desktop ++++++++++++++++++++++++++++ Look for, and remove any Mozilla or Firefox program folders. Do not remove the Mozilla Thunderbird folder if there is one.

Do Not remove any profile folders.

After rebooting the computer, run a registry scanner if you have one. Then run the installer. +++++++++++++++++++++++++++ If there is a problem, start your Computer in safe mode and try again.

How to Start all Computers in Safe Mode; {web link} Free Online Encyclopedia

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I've reinstalled Firefox but I think there's a bug. It's still not showing my website properly. It's fine in Chrome. If I go to Inspector it says the CSS grid is not in use on this page. This is the page I'm looking at. http://www.agilitybits.co.uk/shop/coats/coat_index.html The font in the boxes in Chrome is what I epxected in Firefox. Don't try the other links on this part of the site as I'm working on these pages and only a few are finished.

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You then need to give a screen of Chrome vs Firefox for others to see what your saying is different.

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You can try these steps in case of issues with webpages:

You can reload webpage(s) and bypass the cache to refresh possibly outdated or corrupted files.

  • hold down the Shift key and left-click the Reload button
  • press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
  • press "Command + Shift + R" (Mac)

Clear the Cache and remove the Cookies for websites that cause problems via the "3-bar" Firefox menu button (Settings).

"Remove the Cookies" for websites that cause problems:

  • Settings -> Privacy & Security
    Cookies and Site Data: "Manage Data"

"Clear the Cache":

  • Settings -> Privacy & Security
    Cookies and Site Data -> Clear Data -> [X] Cached Web Content -> Clear

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or userChrome.css is causing the problem.

  • switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Themes
  • do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window

You can remove all data stored in Firefox for a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History -> Show All History" or "View -> Sidebar -> History").

Using "Forget About This Site" will remove all data stored in Firefox for this domain like history and cookies and passwords and exceptions and cache, so be cautious. If you have a password or other data for that domain that you do not want to lose then make sure to backup this data or make a note.

You can't recover from this 'forget' unless you have a backup of involved files.

If you revisit a 'forgotten' website then data for that website will be saved once again.

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Thank you. I think I've sorted it now. It's still saying the CSS grid is not in use on this page, but I think tht's a known bug in Firefox that hasn't been completely fixed yet.

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Little confusion here your first post is talking about your site page your created and then your taking about another site that is causing issue. So what site or pages are you referencing to now? If your saying known bug in Firefox what is the bug site page? And if you delete and clear anything of firefox/mozilla on your computer it won't affect the site page that you created as that isn't connected to firefox browser.

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