Firefox occasionally slows to display one frame per second, unless there is some input.

Question

Put another way, Firefox displays a new image one time each second, as opposed to the usual 60 times. This problem is negated with any user input, such as a mouse movement or key press. This has never occurred outside of Firefox, and no other part of my system is affected. The issue occurs most commonly with multiple tabs open. The only way to temporarily fix the issue is to restart Firefox. However, if I save my tabs, the problem can occur immediately after reloading them. Visiting different websites produces the same results. This is becoming increasingly common, and increasingly aggravating.

Answer 1

Check that your Anitvirus program is not interfering with Firefox.
-> Configuring Firewalls
* https://support.mozilla.com/en-US/kb/Firewalls
-> Do a MALWARE check with these Malware Scanning programs. You need to scan with all programs because each program detects different malware. Make sure that you UPDATE each program to get the latest version of their Databases before doing a Scan. Also, Close All other Applications(softwares) before Starting to Run Scans.
* Malwarebytes' Anti-Malware - http://www.malwarebytes.org/mbam.php
* SuperAntispyware - http://www.superantispyware.com/
* Windows Defender Home Page - http://www.microsoft.com/windows/products/winfamily/defender/default.mspx
* Spybot Search & Destroy - http://www.safer-networking.org/en/index.html
* Ad-Aware Free Internet Security - http://www.lavasoft.com/products/ad_aware_free.php
There are also specialized forums for Malware Removal such as those listed below, where you might be able to get more help:
* Bleeping Computer Forums - http://www.bleepingcomputer.com/forums/
* Spyware Warrior Forums - http://www.spywarewarrior.com/index.php
* SWI Forums - http://www.spywareinfoforum.com/
Check and tell if its working.