Manifest V3: declarativeNetRequest how to get parameter from URL and redirect the URL follow that parameter?

[Ngoc Duc Huynh]

- Hi, on Facebook when click to external request it will go to URL something like this:
l.facebook.com?url=www.examplewebsite.com
- In manifest V2 I simply get URL parameter and then close the tab(l.facebook.com) and open a new tab which URL is URL parameter I get and increase the totalBlocking value by 1 in chrome.storage, in manifest v3 I check the docs about declarativeNetRequest but don't know how to make this work

[wOxxOm]

You could have used regexFilter + regexSubstitution as shown in examples from the documentation, but the problem is that the `url` parameter is percent-encoded:

https://l.facebook.com/l.php?u=https%3A%2F%2Fys.onelink.me%2FZfJN%2F4aqbojxf%3Ffbclid%3DIwAR2Nn3ulP3t_OmIP-f5inVB71NSlmtJP0Ba6It-23bDoStVxb1hA6Smetr8

AFAICT, declarativeNetRequest can't decode it automatically and we can't do it using regexSubstitution either.

Consider adding a feature request on https://crbug.com.