Appending the URL disappeared in user name generator

In the past, you were able to add the url of the website to your email address, to generate unique email addresses and track sellers of user data. But that has disappeared now. I am suspecting the change was required for manifest v3 but I am not sure.
If this is related to manifest v3, I can understand that chromium and chromium-based browsers are no longer supported but firefox said that they continue supporting manifest v2 and I would like to continue having the option of adding the url, instead of some random letters.

Firefox’s announcement to continue supporting MV2: Manifest V3 & Manifest V2 (March 2024 update) - Mozilla Add-ons Community Blog

If this is unrelated to MV3, then why was the support of this function cut?

@musky8212 Welcome to the forum!

If I understand correctly, then you mean this “reported bug”:

?!

Ah, thanks. It seems to be a duplicate then.