Blackboard Learning system tells me I already have a session running.
My schools online resource system tells me I already have a session running when I attempt to open it through Firefox. When I switch to IE it works normally. The problem started when I upgraded to the newest Firefox.
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Other posters have said that they had to roll back to 3.6 to use Blackboard. If you are inclined to do that, here's how.
First, make a backup of your computer for safekeeping. To back up Firefox, see Backing up your information.
Next, download and save Firefox 3.6 to your desktop for future installation. http://www.mozilla.com/firefox/all-older
Close Firefox 4, and uninstall it. Do not remove your personal data and settings, just the program.
Then finally you can reinstall Firefox 3.6. Unless you have installed an incompatible add-on, it should pick up where you left off. If there are serious issues, please post back with details.
Note: I haven't actually tried this myself!