webcompat-addon VS ua-client-hints

Firefox will also rewrite YouTube embeds: https://searchfox.org/mozilla-central/rev/c6d17806faef8708b6....

Firefox also ships a "system" add-on (https://github.com/mozilla-extensions/webcompat-addon) that has interventions and user-agent overrides for many websites. See for yourself in Firefox on about:compat.

Which is still the wrong solution. Heck Firefox is hard-codding fudging their UA due websites that refuses to give features which they support but that the developer managed to never verify https://github.com/mozilla-extensions/webcompat-addon/blame/main/src/data/ua_overrides.js

The Client Hints specification covers a lot of this already - https://wicg.github.io/ua-client-hints/#content-adaptation-u... ... DPR, width, and viewport-width are already available in some browsers. Hopefully other hints will be available soon.

I encourage you to review the decision making and engage in the discussion here: https://github.com/WICG/ua-client-hints

chrome is starting to implement UA-CH, which splits up user agent info into individual headers sent by the client: https://wicg.github.io/ua-client-hints/

As a Firefox/FreeBSD user occasionally annoyed by this nonsense, but not being knowledgeable about modern web standards evolution, I wonder if https://wicg.github.io/ua-client-hints/ will fix this by killing User-Agent headers.

ua-ch might reduce the amount of data browsers send, though it's gonna take a while to move away from regular user agents: https://wicg.github.io/ua-client-hints/

There is a JS companion to this proposal that splits up the information in a similar way

https://wicg.github.io/ua-client-hints/#interface