Why does Firefox have so many unresposive script errors?

Firefox 22.0 (on Mac) seems to be a dog. It continually stops responding and gives so many "A script on this page may be busy, or it may have stopped responding" errors.
Either Facebook have done something, or there is an incompatibility between Flash, Firefox and Facebook or something. (Flash 11.7.700.225)
I have had this before with other Firefox builds - but this time it is occurring multiple times each time I am on Facebook
Thinking of trying Chrome if this keeps up - although I am reluctant to hand yet even more privacy info over to Google.
The only plugin I use is Flash. I run the default theme, and the only add-ons I have are Adblock Plus 2.2.4, Adblock Plus Pop-up Add-on 0.8 and the English (Australian) Dictionary 2.1.2
I wish each so-called 'security upgrade' came with a message that 'this version is a dog' - it is not only causing issues it is not compatible and has disable my "Easy Youtube Video Downloader 6.8"
As per the Mozilla Help I have disabled "hardware acceleration" and also changed the value for "dom.max_script_run_time" to 20 - neither helped in any way.
Far from happy Mozilla

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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