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A website fails to function on Firefox.

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A website that I use normally displays a graph of my variable as a function of time, but it has recently ceased to display the graph. Other data is available in a normal manner on that website. The graph displays when I access the website via Safari (which I rarely use). The uploaded sample images are from Safari and from Firefox. I have enabled pop-ups for that website on Firefox, and I believe I have enabled cookies for that site. Javascript is enabled on Firefox. I can't identify the nature of the problem with Firefox. I am using iMac Pro with OS 12.6 for both. Thanks for any advice.

A website that I use normally displays a graph of my variable as a function of time, but it has recently ceased to display the graph. Other data is available in a normal manner on that website. The graph displays when I access the website via Safari (which I rarely use). The uploaded sample images are from Safari and from Firefox. I have enabled pop-ups for that website on Firefox, and I believe I have enabled cookies for that site. Javascript is enabled on Firefox. I can't identify the nature of the problem with Firefox. I am using iMac Pro with OS 12.6 for both. Thanks for any advice.
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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You can reload webpage(s) and bypass the cache to refresh possibly outdated or corrupted files.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