Firefox: unable to install or write new styles
So I've been using this extension for years. Never had an issue. Maybe performance, but that's my fault. Today I was trying to install a new style, and found out that the "Install with Stylish" button in the userstyles.org website is doing nothing. To get around it, I tried to manually create the style but no window shows up at all.... I can't add new styles!!!
When I click Install, the only clue I'm given is a
e.preventDefault() deprecation warning on a application.js file... afaik warnings shouldn't halt execution. When I try to write a new style manually, I'm given a
browsers[i].contentDocument null TypeError and no editor window is shown.
I'm using Firefox Developer Edition. Any ideas?