Why does firefox open so many Plugin Containers?

When I open firefox it opened quite a few PluginContainer.exe. Here is a picture of all the processes. http://i238.photobucket.com/albums/ff118/lucastars/WTF.jpg I did not do a session restore. My Home Page is the default homepage for firefox.

Thank you for your "copy and paste" reply. It is very obvious that you did NOT read my original post.
If you had you would have noticed:
a) I stated: "I run the default theme"
and that
b)I stated: "I have disabled "hardware acceleration""
c)I stated: "changed the value for "dom.max_script_run_time" to 20 "
(both of which are in response to the linked help article that you recommended - and neither of which did any good)
d) I also stated: "The only plugin I use is Flash"
(which is the latest up-to-date version and if Firefox cannot run with Flash it is of no use as a browser)
I will try "Safe Mode" and post how that works after browsing Facebook - but it should not be necessary to do this.
I had reported similar issues with Firefox two or three builds back (Firefox 19.0.2) then the issue was fixed for a couple of builds - and now with the release of Firefox 22.0 (on Mac) it is as bad or worse than ever.

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