Stylus is a browser extension that allows injecting custom styles to websites and as such, is incredibly powerful in making the web more usable.
After Mastodon update 4.4.0, I noticed (but the problem had been occurring for a longer time, I later learned) that my styles did not apply due to CSP restrictions.
In the dev tools console, I could see
`Content-Security-Policy: The page’s settings blocked the loading of a resource at inline (“style-src”)`
error.
After a bit of searching the web, I found a bug report for Stylus related to this and a comment that provided the solution.
In the extension options, you must turn on Patch CSP to allow style assets and Circumvent CSP 'style-src' via adoptedStyleSheets options to enable Stylus styles in Mastodon sites.
