Extensions (besides their other issues such as security) are also chrome-specific and require chrome-specific knowledge to write. CSS stylesheets are nicely po

Extensions (besides their other issues such as security) are also chrome-specific and require chrome-specific knowledge to write. CSS stylesheets are nicely portable and should work in any (well, most) browser. In general, a browser agnostic solution is preferable to a browser-specific solution, if they have the same functionality.... Stylesheets are also arguably much simpler to write, and far more concise for their problem space. Maybe if user stylesheets didn't exist, you could say it isn't worth the effort to implement them, as javascript extensions are a "good enough" solution for a somewhat rare circumstance. But actually removing the existing, standardized, portable, feature seems a tad bizarre... [It's hard to believe it required much code.]