Two tabs now open, one telling me I'm updated, second for some sort of addon checker

First tab says congratulation Firefox is updated, I already know that, now it opens this tab each time I open my browser.
Second tab is some sort of addon checker thingy.
Thought it might have happened with the upgrade to 16 from 15, down graded, happens there as well. So now back to 16 and still have the problem, except now I have this first tab opening as well.

Did you try to delete the prefs.js file in case there is a problem with some prefs?
It is also possible that there is a problem with the file(s) that store the extensions registry.
Delete the files extensions.* (e.g. extensions.sqlite, extensions.ini, extensions.cache) and compatibility.ini in the Firefox profile folder to reset the extensions registry.
*https://support.mozilla.org/kb/Profiles
New files will be created when required.
See "Corrupt extension files":
*http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
*https://support.mozilla.org/kb/Unable+to+install+add-ons
If you see disabled, not compatible, extensions in "Tools > Add-ons > Extensions" then click the Tools button at the left side of the Search Bar (or click the "Find Updates" button in older Firefox versions) to check if there is a compatibility update available.
If this hasn't helped then also try to delete the addons.sqlite file.

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