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?