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On Firefox 80.1 I receive an "Access Denied on this server when try to reach www.costco.com.

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  • Last reply by cor-el

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On Firefox 80.1 I receive an "Access Denied on this server" when trying to reach www.costco.com. Other sites OK so far. Just upgraded to Firefox 81.0. Site works if you disable browser history but break as soon as you enable history. Why only Costco is a mystery. Costco works OK on Chrome an Chromium. Any ideas appreciated

On Firefox 80.1 I receive an "Access Denied on this server" when trying to reach www.costco.com. Other sites OK so far. Just upgraded to Firefox 81.0. Site works if you disable browser history but break as soon as you enable history. Why only Costco is a mystery. Costco works OK on Chrome an Chromium. Any ideas appreciated

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Your extensions list shows you have extension that can block JavaScript and other content blocking extensions.

If you use extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) that can block content (Adblock Plus, NoScript, 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. You can click shield icon for more detail and possibly disable the protection. You can check the Web Console for messages about blocked content.


You can try these steps in case of issues with web pages:

You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.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 (Options/Preferences).

"Remove the Cookies" for websites that cause problems:

  • Options/Preferences -> Privacy & Security
    Cookies and Site Data: "Manage Data"

"Clear the Cache":

  • Options/Preferences -> Privacy & Security
    Cookies and Site Data -> Clear Data -> Cached Web Content: Clear

Start Firefox in Safe 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 Safe Mode start window