I keep getting a pop up saying Firefox is using far too much memory

If I try to download a video or film something that would have taken 30 minutes is now taking 10-12 hours.
My download speed is showing 4.79 MB/sec but it´s certainly not doing that.

This issue can be caused by the presence of leftover files in the Firefox program folder (defaults\pref) like a file firefox.js that overrides the update URL with a wrong link.
See my post here and do a clean reinstall and be sure to remove the Firefox program folder.
* [/questions/826858]
Do a clean (re-)install:
Download a fresh Firefox copy and save the file to the desktop.
* Firefox 4.0.x: http://www.mozilla.com/en-US/firefox/all.html
* Uninstall your current Firefox version and remove the Firefox program folder before installing that copy of the Firefox installer.
* Do not remove personal data if you uninstall the current version.
* It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.
Your bookmarks and other profile data are stored elsewhere in the [http://kb.mozillazine.org/Profile_folder_-_Firefox Firefox Profile Folder] and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.

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