Question regarding scheme pages

[Snapy]

I was just wondering if for example the opera-scheme was useful on non Opera browers or if it is a scheme shared between all browsers like behind-the-scene. Same question regarding chrome-extension-scheme on non Chromium browsers. Also are there any other existing schemes.

[gorhill]

I am guessing opera-scheme is encountered only on Opera. Some may be shared, like the chrome-scheme (Chromium, Firefox, Opera). Some applies to all browsers, like data-scheme, file-scheme.

The -scheme "hostnames" are just a trick used by uBlock to enable working on web page which URL does not have a formal hostname. uBlock in such case uses the scheme part of the URL to create a fake hostname, so that features such as whitelisting or dynamic filtering can work.

[Snapy]

Thanks. It was to be sure I could remove some whitelisted schemes safely.