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Toomany websites breaking

  • 2 replies
  • 0 have this problem
  • 4 views
  • Last reply by cor-el

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I have been using Firefox for about a decade. Lately, most of the websites I use have not been working properly (from utilies and providers to my own website admin page) Some adresses won't even start to load when enetered into the bar.

I have a lot of bookmarks and bookmarks folders, yes. But I hope this is not the issue, as I need them for work.

I am using Mullvad vpn. (found Mozilla's VPN pretty much useless : it tells you right away you're connected, even when it is not actually using proper tunnels yet, especially on IOS. and when locating the VPN in France, France's news websites would refuse to play videos, stating that I am in the US...)

I use Evernote a lot, but over the last few days it's clipper stopped working as well (when clicking the email link to verify my Evernote account, the link opening in Firefox never opens a page..)

I have to use Safari for half of my work online now, which means I will switch everything to Safari next week if I cant find a solution to make Firefox work.

I already erased and re-downloaded Firefox quite a few times. Changing, then resetting all preferences and security settings. To no avail.

Thank you for your help ! Loic

I have been using Firefox for about a decade. Lately, most of the websites I use have not been working properly (from utilies and providers to my own website admin page) Some adresses won't even start to load when enetered into the bar. I have a lot of bookmarks and bookmarks folders, yes. But I hope this is not the issue, as I need them for work. I am using Mullvad vpn. (found Mozilla's VPN pretty much useless : it tells you right away you're connected, even when it is not actually using proper tunnels yet, especially on IOS. and when locating the VPN in France, France's news websites would refuse to play videos, stating that I am in the US...) I use Evernote a lot, but over the last few days it's clipper stopped working as well (when clicking the email link to verify my Evernote account, the link opening in Firefox never opens a page..) I have to use Safari for half of my work online now, which means I will switch everything to Safari next week if I cant find a solution to make Firefox work. I already erased and re-downloaded Firefox quite a few times. Changing, then resetting all preferences and security settings. To no avail. Thank you for your help ! Loic

All Replies (2)

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Have you tried clearing the cache and disabling the VPN

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You can check the Web Console (Tools -> Web Developer) for messages about blocked content and about the presence of mixed or unsafe content.

You can check the Network Monitor to see if content is blocked or otherwise fails to load.

If necessary use "Ctrl+F5" or "Ctrl+Shift+R" (Mac: Command+Shift+R) to reload the page and bypass the cache to generate a fresh log.


If you use extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) that can block content (Adblock Plus, NoScript, DuckDuckGo PE, Disconnect, Ghostery, Privacy Badger, uBlock Origin) always make sure such extensions do not block content.

Firefox shows a purple shield instead of a gray shield at the left end of the location/address bar in case Enhanced Tracking Protection is blocking content.

  • click the shield icon for more detail and possibly disable the protection

You can check the Web Console for relevant-looking messages about blocked content.


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 if userChrome.css/userContent.css is causing the problem.

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