Those aren’t extensions that an average user would install.

Just Smart Referer alone is a likely culprit. Masking or having no referer is a prime attribute for low-level bots.

oh... so i should not be able to use any websites because of the extensions I use?

You should not be able to use any website that the host doesn't want you to use. That seems pretty straightforward. There's a strong correlation between profiles that look like yours and bots. Why should the web admin do free labor for you to put together a sufficiently nuanced bot-detection system to tell the difference, when the one they have is clearly good enough for them?

Stop using smart referrer. It has no legitimate purposes. Referrer URLs are not the problem. You look like a bot and you going to get locked out of sites.

If you're actually concerned about that kind of data leakage, you want NoScript, full stop.