How to disable nag screens about updating to Firefox 24

I would like to know how to disable the endless nag screens inviting me to update to Firefox 24. I do not want Firefox 24 because I tried it for two weeks and it was repeatedly crashing - several times in each day - or simply freezing. I cannot work this way and so I have downgraded to a previous version of Firefox and I have not had a single problem in a whole month. Please be aware that I do not allow Norton products on my computer so that is not an issue. I keep a very clean computer - scanning EVERY night before shutdown with CCleaner and JetClean with Avast running permanently in the background. I also scan weekly with Superantispyware.

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