Crazy disk usage + frequent crashes after update

Question

After updating to version 35, Firefox has become almost unusable. No other change was made to my system, which worked fine up until the update.
The browser starts and works fine for a few (not consistent) minutes, then starts using the hard drive heavily, slowing down the bowser itself and everything else. Usage has a 'saw' pattern, going regularly from 50% to 90% every couple of seconds. All stops when I close Firefox. I couldn't pinpoint a particular website that triggered this behaviour.
Also the browser has crashed 4 times in less than 48hrs.
Win8.1 64, 16GB ram, Nvidia GT640, all software (including plug-ins) up-to date.
Please advise, thank you

Answer 1

We're sorry to hear that Firefox is crashing. In order to assist you better, please follow the steps below to provide us crash IDs to help us learn more about your crash.
#Enter ''about:crashes'' in the Firefox address bar and press Enter. A Submitted Crash Reports list will appear, similar to the one shown below.
#Copy the '''5''' most recent Report IDs that start with '''bp-''' and then go back to your forum question and paste those IDs into the "Post a Reply" box.
''' Note:''' If a recent Report ID does not start with '''bp-''' click on it to submit the report.
(Please don't take a screenshot of your crashes, just copy and paste the IDs. The below image is just an example of what your Firefox screen should look like.)
;[[Image:aboutcrashesFx29|width=500]]
Thank you for your help!
More information and further troubleshooting steps can be found in the [[Firefox crashes - Troubleshoot, prevent and get help fixing crashes]] article.''meegee [[#question-1041722|said]]''
<blockquote>
After updating to version 35, Firefox has become almost unusable. No other change was made to my system, which worked fine up until the update.
The browser starts and works fine for a few (not consistent) minutes, then starts using the hard drive heavily, slowing down the bowser itself and everything else. Usage has a 'saw' pattern, going regularly from 50% to 90% every couple of seconds. All stops when I close Firefox. I couldn't pinpoint a particular website that triggered this behaviour.
Also the browser has crashed 4 times in less than 48hrs.
Win8.1 64, 16GB ram, Nvidia GT640, all software (including plug-ins) up-to date.
Please advise, thank you
</blockquote>