If you are able to (and allowed), install an AdBlocker (e.g. uBlock Origin) to reduce the friction for such cases. In my experience these ads are rarely click-worthy.

Not sure where you get that information from

Probably from playing it themself. Nowhere in the text you linked is stated that you need the client. Only a valid account and internet.

So no, Overwatch 2 on Steam doesn't require a secondary launcher. Source: me, I play it on Steam.

Just want to leave this here: Brave is a Corporation, which is profit orientated and Mozilla is a Non-Profit-Organisation.

Without having checked the addon you mentioned, it seems like that the author didn't register openai.com as site in his addon metadata. That's why Firefox tells you it can't access the current site (chat.openai.com).

The new domain restriction only applies to Mozillas own domains (mozilla.com), e.g. to prevent plugins to spoof official sites like the addon marketplace.

What happened with "clash-verge"? It's archived and the last commit nuked the repository.