Well can work on 1 here. From the Firefox Menu (toolbar) Click History and then you can do 2 things : Delete Recent History click . If you want the Full History Click and can delete each month that you wish. If you mean how to delete your Cache Click Tools then Options go to Privacy and Security Left side and then Cached Web Content You can also Clear Current History on this page and select options. Please update your Graphics Drivers as they are from driverDate: 3-19-2012 https://downloadcenter.intel.com/product/80939/Graphics-Drivers I would suggest updating all your Motherboard Drivers if that is still possible from the manufacturers website. Also : Type or paste about:studies in the address bar and press Enter (or Return) to load that page. If you are enrolled in a user interface experiment, it should be listed on this page and there should be a way to uninstall/remove or to opt out. We are looking for anything can opt out of but specially Firefox Search Test 1.0 Also : Type or paste about:support and see if Multiprocess Windows is on or off. If is on, come back for help to turn off. You could also uninstall your Awesome Screenshot - Capture, Annotate & More 3.0.21 (jid0- if so wish as Firefox now comes with a Screenshot program but up to you. You may also want to think about going to the Extended Release Version https://www.mozilla.org/en-US/firefox/organizations/ Considering this System is rather old and would preform better. Please let us know if this solved your issue or if need further assistance.

See also: *https://support.mozilla.org/en-US/kb/delete-browsing-search-download-history-firefox