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Why is Firefox so slow? (Ubuntu 20.04)

  • 2 replies
  • 1 has this problem
  • Last reply by cor-el

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I got a second hand HP Spectre x360 (2015) today which came with Ubuntu 20.04 preinstalled and it seemed fine at first but when I connected to the internet I found Firefox to be incredibly slow to load any site I tried to access. Trying to watch a video on youtube took about two minutes to load. Facebook and Gmail both refuse to load properly at all. No matter what site I try, it seems to take at least 30 seconds to load, if it loads at all. This might be the slowest computer I've ever used, and I remember the 90s! I know the internet connection isn't the problem since my other devices work perfectly. I tried to download some other browsers (Chrome, Opera, Vivaldi) to see if Firefox was causing the issue but they all failed to download properly (error message "failed to install file: not supported").

I'm at a loss. I've tried searching for answers online which suggested fiddling with the proxy settings and going to about:config to toggle the "network.dns.disableIPv6" from "false" to "true". and nothing seems to have helped so far. Any ideas please? I like the computer but it's totally unusable for me at this point.

All Replies (2)

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Hi geosebastian89,

Try Refreshing your Browser:-

  • To do this, click the menu button at the top right corner of the Firefox window.
  • Click the “Help” option near the bottom of the menu.
  • Click the “Troubleshooting Information” option in the Help menu.
  • Click the “Refresh Firefox” button at the top right corner of the Troubleshooting Information page.
  • You’ll be warned that this will remove your browser add-ons, reset your customizations, and revert other browser data to the default settings. Click “Refresh Firefox” to confirm you want to make these changes.

If it doesn't solved your problem, then feel free to ask in Reply Section. Thanks for raising your question in Mozilla Support Forum.


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Try the Firefox version from the official Mozilla server if you currently use a version from the repositories of your Linux distribution to see if that makes a difference.


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