Hello Yufina,

That must be annoying ....

Would you try this please :

Type in the address bar about:config and press Enter (promise to be careful, if asked)

Type in the search bar :

accessibility.blockautorefresh

and make sure its value is set to true

If you had to change the value, then close and restart Firefox.

'Hope this helps .....

Firefox shouldn't suspend tabs that quickly.

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 is 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

• https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

See also the about:memory page.

No help with those.

Yufina said

No help with those.

Maybe you could switch to the release Firefox version (66.0.2) ......

It seems that Firefox version 66.02 is ok, after quick look. So problem seems to be in 67.

EDIT: Same thing happening with Nightly

Be cautious with using the same profile with different Firefox versions, especially nightly builds, as this can easily make a profile incompatible with older Firefox versions like release or cause problems when at a later time Firefox 67/68 becomes the release version.

• https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles