edit: This became a five star add-on with all reasons for being four (and a half:)) star being fixed and improved with version 0.9. USM is the new Stylish: Thanks a lot to the developer:)
This is a nice addon and a lightweight alternative to Stylish. Not quite there yet, but keeps getting better, very promising. Thank you:)
In the latest version (v.0.8), the chevron of the toolbar icon (the little triangle to display options) is changed and put under the icon -- it was on the side of the icon. Please bring the old look back -chevron to the side- as the chevron adds an unnecessary height to the add-on toolbar (aka status bar) and also looks really bad - icon not being in line with the other icons, etc. Also, the toolbar icon constantly resets its location after firefox restarts.
Thanks again :)
Reply to the developer:
Dear Developer, with your continuous support you are already a 5+ star developer :) the four stars were only for the extension as of v. 0.8, mainly due to the interface issues and as you pointed out aptly, better integration with userstyles.org - I find this add-on really promising and a better future replacement for stylish, as it seems it is aspiring to be as such, based on your comments. As it is, ths add-on is already very useful, and promise 5 stars once this ui issue is fixed (this is not an accessibility issue though, I love to see the addons I like and that have nice icons on the toolbar if I can). For the add-on toolbar issue, however, I think it is more likely to be caused by one of your other excellent add-ons (location bar enhancer), sorry for confusing it here - I made a mention here now just FYI.