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For example, I have Stylish style for http;//example.com site. How I can modify my file in my preferred text editor? I don't want to create new style.

(And I don't find bugtracker for your addon.)

Thanks.

PS: @ChoGGi,
+ I set my text editor — http://i.imgur.com/Jnn7Hj1.png
+ I begin to edit my style → I don't find item for open file in external editor → http://i.imgur.com/EyY5XFm.png

Is it possible to realize behavior like in Greasemonkey? I open file in external editor → I edit and save file → I can to see my changes — http://i.imgur.com/yehC6Bn.png

Thanks, now all works for me!

Questa recensione riguarda una versione precedente (0.8.7) del componente aggiuntivo. 

You should be seeing changes as soon as you save the external file?
I've been working on 0.8.8, you can try and see if it helps
https://choggi.org/misc/Stylish-Custom/Stylish-Custom-0.8.8.3.xpi
https://choggi.org/misc/Stylish-Custom/change.log
The ID/Name is different so be aware; you'll need to disable the release version.

https://github.com/ChoGGi/Stylish-Custom


Edit: when you're in the style edit dialog; you'll need to manually add the external editor button (it's global for all styles once you add it)
rightclick and goto customize