DropDown menu not working at firefox 5

go to Help Menu -> select "Restart with Add-ons Disabled" -> Update ALL your Firefox Plug-ins https://www.mozilla.com/en-US/plugincheck/ -> go to View Menu -> Zoom -> click "Reset" -> go to View Menu -> Page Style -> select "Basic Page Style" -> go to View Menu -> Toolbars -> unselect All Unwanted toolbars -> go Tools Menu -> Clear Recent History -> ''Time range to clear: '''select EVERYTHING''''' -> click Details (small arrow) button -> place Checkmarks on ALL Options -> click "Clear Now" -> go to Tools Menu -> Options -> General -> ''When Firefox starts : '''select "Show My Home Page"''''' -> Type the address of the website which you want to be your HomePage e.g. http:www.google.com -> place Checkmark on "Show the Downloads window when downloading a file" -> select Radio Button option2 "Always ask me where to save files" -> go to Tools Menu -> Options -> Content -> place Checkmarks on: 1) Block Pop-up windows 2) Load images automatically 3) Enable JavaScript -> go to Tools Menu -> Options -> Privacy -> History section -> ''Firefox will: '''select "Use custom settings for history"''''' -> Remove Checkmark from "Permanent Private Browsing mode" -> place Checkmarks on: 1) Remember my Browsing History 2) Remember Download History 3) Remember Search History 4) Accept Cookies from sites -> select "Exceptions..." button -> Click "Remove All Sites" at the bottom of "Exception - Cookies" window 4a) Accept Third-party Cookies -> under "Keep Until" select "They Expire" -> REMOVE CHECKMARK from CLEAR HISTORY WHEN FIREFOX CLOSES -> go to Tools Menu -> Options -> Security -> place Checkmarks on: 1) Warn me when sites try to install add-ons 2) Block reported attack sites 3) Block reported web forgeries -> Click OK on Options window -> click the Favicon (small drop down menu icon) on Firefox SearchBar (its position is on the Right side of the Address Bar) -> click "Manage Search Engines" -> select all Unwanted Search Engines and click Remove -> click OK -> go to Tools Menu -> Add-ons -> Extensions section -> REMOVE All Unwanted/Suspicious Extensions (Add-ons) -> Restart Firefox You can enable your Known & Trustworthy Add-ons later. Check and tell if its working.