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What did you use about:config for? closest I could find is about:flags in ChromeFirefox is improving, version 31 nightly scores 475 for HTML5.
I've tried to like chrome, but I can't leave Firefox, it has so many add-ons and features chrome doesn't have. About:config is also a major plus for me.
Opening sites are super slow on Firefox 29 for me.
How many addons do you have active ?
Press Ctrl+Shift+A to view the list of addons and disable them one by one to see which one is causing the problem.
You have 3 other scenarios you can try:
1) Start in Safe-mode
2) Reset firefox to original state
3) uninstall firefox , download a new copy of the file and re-install
If you still experience slowness, run Ccleaner on your machine - to cleanse the machine of excess waste-of-space-files (temporary files, etc)...