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How do I add custom css to Firefox default homepage via addon?

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I've noticed that the "chrome/userContent.css" file doesn't effect the homepage anymore, but I'd rather do it through an addon. Is it possible to inject css into firefox's default homepage?

I've noticed that the "chrome/userContent.css" file doesn't effect the homepage anymore, but I'd rather do it through an addon. Is it possible to inject css into firefox's default homepage?

Ọ̀nà àbáyọ tí a yàn

Hi Computer, you should still be able to restyle Firefox's built-in home page using rules in a userContent.css file. However, the page changes frequently, so your rules might need an update.

You might find help for what you want to do on the following site, since pre-release versions often are discussed there, or feel free to ask about what you need here:

https://www.reddit.com/r/FirefoxCSS/

As for using an extension, they don't have rights to modify very many about: pages, so if something like the Stylus extension doesn't seem to be working, you'll need to use userContent.css.

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Ọ̀nà àbáyọ Tí a Yàn

Hi Computer, you should still be able to restyle Firefox's built-in home page using rules in a userContent.css file. However, the page changes frequently, so your rules might need an update.

You might find help for what you want to do on the following site, since pre-release versions often are discussed there, or feel free to ask about what you need here:

https://www.reddit.com/r/FirefoxCSS/

As for using an extension, they don't have rights to modify very many about: pages, so if something like the Stylus extension doesn't seem to be working, you'll need to use userContent.css.

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Note that there are two versions of the Firefox Home page, about:home and about:newtab. You need to specify both pages in a @-moz-document url-prefix block.

@-moz-document url-prefix(about:home), url-prefix(about:newtab) {
/* CSS code goes here */
}