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Firefox page hangs, busy indicator, very low cpu, on some sites. I have an example.

  • 5 replies
  • 2 have this problem
  • 135 views
  • Last reply by cor-el

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Firefox 41.0, Win 10 Pro x64. Recently (possibly before V41) Firefox pages hang with very low cpu on some sites. Firefox itself is not hung, but for that tab, the clock indicator keeps ticking. I'm opening the problem while another tab is experiencing the problem. Some data from the web site is usually displayed (background?). Perhaps there is a redirect/redisplay of some sort (complete guess). Note: In this case, the web site is grayed out. Example: https://www.code42.com/store/ Problem occurred when I navigated to the above URL. Also occurred when I pasted the URL. Works in Chrome Version 45.0.2454.101 m. Works in Edge 20.10240.16384.0

Note: right now, as I try to upload an image, the upload doesn't complete. Clock ticks.

I'm going to try to submit this anyway.

Chosen solution

I was about to follow the instructions in the above post, but tried the web site to verify the problem continued. It didn't. I don't know what I did (perhaps I cleared the cache as I was poking about). Anyway. please close this incident. And thanks for your help.

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I checked your link and had no problem.


Use this link to check that your plugins are up-to-date. If any are listed as unknown or research, do not worry about them.


Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac Options)
key, and then starting Firefox. Is the problem still there?

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Sorry to have taken so long to get back to you.

I turned off Privacy mode, but that didn't help.

With Privacy mode off, I tried safe mode. Same result. Firefox hung with the busy icon operative.


- Steve

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Do you see any status message at the bottom of the Firefox window?

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You can reload web page(s) and bypass the cache to refresh possibly outdated or corrupted files.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 cookies only from websites that cause problems.

"Clear the Cache":

  • Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

  • Firefox/Tools > Options > Privacy > "Use custom settings for history" > Cookies: "Show Cookies"

Start Firefox in Safe Mode to check if one of the extensions (Firefox menu button/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

  • Switch to the DEFAULT theme: Firefox menu button/Tools > Add-ons > Appearance
  • Do NOT click the Reset button on the Safe Mode start window
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Chosen Solution

I was about to follow the instructions in the above post, but tried the web site to verify the problem continued. It didn't. I don't know what I did (perhaps I cleared the cache as I was poking about). Anyway. please close this incident. And thanks for your help.

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You can make a note of the steps I posted above in my reply as they are useful. In a lot of cases a reload with bypassing the cache is sufficient to recover from issues.

  • 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)