Plugincheck opens in a tab every time I start Firefox.

Lately, every time I start Firefox, I get two tabs: one with my homepage (which I expect), and the other tab is https://www.mozilla.com/en-US/plugincheck/. The plugincheck tab is in the foreground and quite annoying. Why did this start happening? How can I stop it?

What is the value of the pref plugins.update.notifyUser on the about:config page?
To open the about:config page, type about:config in the location (address) bar and press the "Enter" key, just like you type the url of a website to open a website. 
If you see a warning then you can confirm that you want to access that page. 
You can use the Filter bar at to top of the about:config page to locate a pref more easily.

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See these articles for some suggestions:
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*https://support.mozilla.com/kb/How+to+set+the+home+page - Firefox supports multiple home pages separated by '|' symbols
*http://kb.mozillazine.org/Preferences_not_saved

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* https://support.mozilla.com/kb/Firefox+has+just+updated+tab+shows+each+time+you+start+Firefox
* https://support.mozilla.com/kb/How+to+set+the+home+page - Firefox supports multiple home pages separated by '|' symbols
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*http://kb.mozillazine.org/Preferences_not_saved
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I crammed the info into the subject line, but to repeat...
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* https://support.mozilla.com/kb/How+to+set+the+home+page - Firefox supports multiple home pages separated by '|' symbols
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Plugincheck opens in a tab every time I start Firefox.

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