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I have recently upgraded from Ubuntu 17.04 to 17.10. After the upgrade, Firefox has become very slow when loading pages. Once a page has loaded everything is as usual (for instance, YouTube plays fine) and the menus are responsive but loading a page takes several seconds. As a comparison, Google Chrome is quite fast.

I'm using Firefox 57.0.1 64-bit. I've already tried clearing the cache and site data, removing it (apt-get purge firefox then deleting the remaining files in the Home folder) and reinstalling through the command line but nothing changed.

I would be very grateful for any advice. If nothing works I can always do a clean install of 17.04 (I had to install Unity on 17.10 anyway because the experimental fractional scaling on GNOME didn't work well) but I would rather not have to set up everything again. Thank you very much!

Update: Removing Firefox and installing the version provided directly by Mozilla following these instructions did not help.

  • @lamrub3n Thank you for the edit, but the package is called firefox with a lowercase f. – PerlDuck Dec 26 '17 at 15:59
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It seems that the problem was with Firefox itself rather than Ubuntu. I suppose Firefox must have been updated after the upgrade to 17.10.

I had a look at Mozilla's instructions for when Firefox can't open websites while other browsers can and disabling IPv6 did the trick. Using the page loading time plugins from this answer on SO to measure performance, Firefox and Chrome now have similar loading times, even if the latter is often slightly faster.

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