GitHub issue #8 and couple of minor changes #9
The original icon is fine in all of it's sizes, and all of the blocked images are similarly distorted
About Ubuntu on Windows, it's a translation layer for linux syscalls(?)
Oh. My hope was that it's not that case (official Ubuntu from Microsoft).
I use ImageMagick 184.108.40.206 from Fedora repos.
Tried a common alternative tool advised in internets: rsvg.
Workaround might be to convert X to a vector object, not text.
GitHub issue ckuhl#8: "[wishlist] please use more contrast button icon" Current icons are black and hardly visible on dark FF themes. Use modified SVG source with light outline for better visibility. Remove PNG files from repo and generate them in makefile. Add 16x16 and 24x24 png size as well. SVG taken from Ionicons iconset (http://ionicons.com/) and are used here under the MIT license: http://opensource.org/licenses/MIT