1.- The first webextension is not working properly for me. Firefox freezes from time to time and I need to kill firefox.exe process.

2.- I can´t open preferences window, because clicking on "create a new style" or "manager styles" options, does not doing nothing, I need to click on "edit" option on some installed addons to open addon preferences.

3.- I installed some style like https://userstyles.org/styles/25811/amo-dark-theme but sylish is not aplying the style. The style is properly applied by using latest Legacy version.

I imported manually an own style, and the style has been applied properly.

4.- There is no option to apply style as preview or I can´t find it, it is very useful to test style code modifications before saving code changes.

4.- I personally, I don´t like anymore the new Stylish style, splitted by sections.

I like the old stylish style , where you can see the whole style code while editing, making some modifications and preview changes before saving changes.

Please, can you add some option to use the old Stylish style, to create/see/edit/paste the style code as the legacy style versions?