Likely you have other issues. Try a new profile Make a shortcut on your desktop to "C:\Program Files (x86)\Mozilla Firefox\firefox.exe" -no-remote -p if you have a 64 bit OS, or "C:\Program Files\Mozilla Firefox\firefox.exe" -no-remote -p if not.
Below are most of my favorite add ons (extensions)
Tab Mix Plus 0.3.8.6 https://addons.mozilla.org/en-US/firefox/addon/tab-mix-plus
Session Manager 0.7.5 https://addons.mozilla.org/en-US/firefox/addon/session-manager/
savewithurl - 0.2.11 version for Firefox 2.0 - 5 https://nic-nac-project.org/~kaosmos/savewithurl-FF5-0.2.11.xpi
Menu Editor http://menueditor.mozdev.org/
Googlebarlite https://addons.mozilla.org/firefox/downloads/latest/492/addon-492-latest.xpi?src=search
FindBar Tweak https://addons.mozilla.org/en-US/firefox/addon/findbar-tweak/
ColorfulTabs https://addons.mozilla.org/en-US/firefox/addon/colorfultabs/?src=search/
Send Tab URLs https://addons.mozilla.org/en-US/firefox/addon/send-tab-urls/?src=ss
Copy as HTML Link https://addons.mozilla.org/en-US/firefox/addon/copy-as-html-link/?src=search
Google/Yandex search link fix https://addons.mozilla.org/en-US/firefox/addon/google-search-link-fix/
Xmarks Sync https://addons.mozilla.org/en-US/firefox/addon/xmarks-sync/?src=search
BBCodeXtra is an extension, which adds to the context menu new commands to insert BBCode/Html/XHtml codes in an easy and fast way... https://addons.mozilla.org/en-US/firefox/addon/bbcodextra/
Lazarus: Form Recovery https://addons.mozilla.org/en-us/firefox/addon/lazarus-form-recovery/
Converter https://addons.mozilla.org/en-US/firefox/addon/converter/
FlashGot https://addons.mozilla.org/en-US/firefox/addon/flashgot/?src=search
Google-translator-for-firefox/ https://addons.mozilla.org/en-Us/firefox/addon/google-translator-for-firefox/
FT DeepDark https://addons.mozilla.org/en-US/firefox/addon/ft-deepdark/
Noiascrollbars https://addons.mozilla.org/en-US/firefox/addon/noiascrollbars
Classic Theme Restorer https://addons.mozilla.org/en-US/firefox/addon/classicthemerestorer/
Memory Restart https://addons.mozilla.org/en-US/firefox/addon/memory-restart/
stay-Open Menu https://addons.mozilla.org/en-US/firefox/addon/stay-open-menu/
Tabs On Bottom https://addons.mozilla.org/en-us/firefox/addon/tabs-on-bottom/
Restart https://addons.mozilla.org/en-us/firefox/addon/re-start/?src=cb-dl-toprated
Mozilla Archive Format https://addons.mozilla.org/en-us/firefox/addon/mozilla-archive-format/
Open In Chrome https://addons.mozilla.org/en-US/firefox/addon/open-in-chrome/
Open in Ie https://addons.mozilla.org/en-US/firefox/addon/open-in-ie/
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I’m a big fan of Pale Moon, which is just a fork of Firefox that’s gutted all the unnecessary crap and fixed most of the memory leaks, something Mozilla refuses to do.
Runs all FF addons as long as you don’t go past version 24.7.1 x86 and don’t let it update.
I run with Adblock Plus, BetterPrivacy, Element Hiding Helper for Adblock Plus, CookieCuller, Flash Video Downloader Youtube HD Download, IE View, Pale Moon Commander, Ref Control, View About, Tab Mix Plus, and Visited. I have mixed feelings about Blur, but use it to stop trackers. It can be annoying, but useful.
Ref Control lets you bypass certain firewalls like the Wall Street Journal firewall. TabMixPlus is a big win for power users. Adbock Plus is indispensable, and it’s Element Hiding Helper lets you easily nuke annoyances on individual web sites. BetterPrivacy let’s you nuke LSO’s. CookieCuller is a great cookie manager; very useful for preserving login cookies but nuking the rest.