What made me have the problem that (in the end) made me start this thread, is the fact that I could not either, in youtube: paste text in the comments I was writing; "paste" selected text with middle mouse button click, which is something I frequently use in several windows. It simply did not work on youtube (and I did not try on most other sites I use, or did not note if they also have this "feature").

I was curious to understand how that was achieved. And it annoys me the way that youtube make its page hard to use with simple things. If the "cannot paste, cannot select, cannot whatever" is something that CSS has - as I have discovered that may be true -, I want to turn all those off in the browsers I use! This is something that my ideal browser must do - and if you know how to do that in Firefox (or its brothers), please tell. Does the page want to forbid me to paste in it? I will paste in it! Does it forbid that I copy the text I can read? I will copy the text I can read! And I do not want those things to be hard to do.

one word:
javascript.
some browsers have options to prevent it from hijacking your mouse, but i suspect even that won't activate middle-click pasting.

no, you probably have to use a right-click menu.
and this has nothing to do with CSS - as i said, it's javascript.
try noscript.
you can disable javascript, but then you won't be able to use youtube.
you can disable javascript selectively, but then you won't be able to use youtube's comment system.
been there, done that.

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