Hi !
I am using Ubuntu 12.11 Desktop on Kernel Linux 3.5.0-21-generic with 2x2,60GHz and 2 Gb RAM.
During the last month I came across the following problem - when I start to write a new letter in the Thunderbird, in the moment I put the mouse on the field of the "title" (or "object") of the letter, the Thunderbird blocks. After some minutes it gives me that script does not work and I should choose either to stop the script, either to continue. Whatever I select, nothing improves and the thunderbird stays blocked.
The message shows me this script:
" resource:///components/nsContentPrefService.js:463"
I searched if there is some problem in the net, but I found nothing.
Could you show me how to solve this problem, because I can not write a letter with "objet" (or title)?
Thanks!

See Unresponsive Script Warning: Finding the source of the problem but personally I'd start with the "create new profile" part.

Thanks a lot.
This did not work out. I will ry once more, but maybe, the problem is somewhere else, not the profile.

I'd say at least ninety per cent of Mozilla problems relate to plugins and user profile settings so trying that first may (or may not) be a quick win. If it isn't, and nsContentPrefService.js apparently is a core component, it may be affected by system dependencies. Since you said "During the last month" you could check which dependencies, for example Xulrunner, were updated. If that doesn't give any clues either you could try debug logging and file a bug report straightaway.