Aaron Digulla wrote:
> Hello,
>
> On my linux system, TB 2.0 crashes very often (it crashed 2s after I
> started it the first time and now again after using it for an hour or
> so). Looking at Talkback, it seems a pretty common problem (MTBF of
> 5.87s). When it crashed the first time, I did turn off the talkback
> service. How do I enable it again? There is no option in the Add ons
> page and I also couldn't find anything in the preferences.
>
> Regards,
>

first , don't post multiple post on same topic.

goto Tools>Add-ons>Extensions, select Talkback , an 'Enable' button will
be shown up on it , click on it . restart TB.

if getting same problem or you don't find any such Enable button , close TB.
goto TB profile folder "http://kb.mozillazine.org/Profile#Thunderbird".

delete these files:
extensions.ini
extensions.rdf
extensions.cache

start TB. now try to enable that extension.

Aaron Digulla wrote:
> Hello,
>
> On my linux system, TB 2.0 crashes very often (it crashed 2s after I
> started it the first time and now again after using it for an hour or
> so). Looking at Talkback, it seems a pretty common problem (MTBF of
> 5.87s). When it crashed the first time, I did turn off the talkback
> service. How do I enable it again? There is no option in the Add ons
> page and I also couldn't find anything in the preferences.

Probably you need to run
/your/path/to/thunderbird/extensions/talkback@mozilla.org/...
/components/talkback/talkback

Then go to the Settings menu and select "Turn talkback on"