You could try this please : Go the Menu then Tools --> Options --> Performance and untick everything. change the recommended size lower, then see how it runs. Hardware Acceleration might have also been a issue so turn it off. Run it later and see as you turn things back on and test it, and again. Restart Firefox after making these changes please.

This will help maybe: See if you can find updates for your Intel(R) HD Graphics as they are A little old : driverDate: 1-30-2013 You can Google Intel(R) HD Graphics and find the download page https://downloadcenter.intel.com/product/80939/Graphics-Drivers, but you may have to know what generation chipset you are using. GPU-Z will tell you this https://www.techpowerup.com/gpuz/ Can also try : https://www.intel.com/content/www/us/en/support/detect.html I do see errors in the drivers. Old & corrupted Drivers cause a wide range of issues. Please keep them updated to prevent issues and you never know when Intel will stop supporting them.

Please let us know if this solved your issue or if need further assistance.

I turned off the acceleration and limited the size to 2 processes, although I do still see 4 or 5 processes active. ASO3, Driver Toolkit, and Intel Driver and Support Assistant all indicate that 1/30/13 is the latest update for INTEL(R) HD GRAPHICS. I still have the problem. The combined FIREFOX processes RAM usage has climbed to over 3GB (system RAM is 4GB). FIREFOX crashes around 95% RAM usage, but it slows considerably before that point. I see no problem with any INTEL driver. I will be augmenting RAM soon, but that may just reduce this problem. Any more suggestions?

Please Refresh but do this 1st:

• https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer
• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

then

• https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings

TEST....... If no issues then Extensions which need to be added back in 1 at a time and tested ..... Or it is your Profile : Make a new one and test ...:

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

If is your Profile :

• https://support.mozilla.org/en-US/kb/recovering-important-data-from-an-old-profile
• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

Note: Any customization will revert back to default, you will also need to reinstall Extensions.

Please let us know if this solved your issue or if need further assistance.

See also:

• https://support.mozilla.org/en-US/kb/firefox-uses-too-much-memory-ram