1. Try Firefox's safe mode Diagnose Firefox issues using Troubleshoot Mode
2. If that fails try a Firefox Reset, but read the linked article first, you will loose some information. Reset Firefox preferences to troubleshoot and fix problems
   • First close open tabs, or bookmark them.
3. If the problem continues please paste a copy of the error message into your next post

• This is an English language forum Google Translate may help you Google Translate может помочь Вам

В безопасном режиме сообщение об ошибке не появляется. Окно ошибки содержит следующий текст :Приложение Java Script

          Error: Illegal operation on WrappedNative prototype object

Try Firefox's safe mode, also disable all plugins.

• see Diagnose Firefox issues using Troubleshoot Mode
• Disable or remove Add-ons

Then re-enable one at a time to find which one causes the problem. Please post back when you find the guilty extension that is causing your problem.

You did not post details of your extensions did you have problems in doing that when following the prompts to post a question ?

For a quick fix use Firefox Reset as explained in this article:

• Refresh Firefox - reset add-ons and settings

Read the article first because you will loose some information.

Related threads

• I get this message on the new Firefox v22 -Error: Illegal operation on WrappedNative prototype object /questions/963203
• I just upgraded to FireFox 22.0, and now I get a Javascript error (Error: Illegal operation on WrappedNative prototype object). What can I do? /questions/963014
• "JavaScript application" Alert message /questions/964464
• Error: (Ilegal operation on Wrapped Native Prototype Object) after new security update/questions/964038?

it appears addons cause the problem, but there may be more than one addon that is a problem