Penetrating oil (I favor Kroil myself) and time, with some gentle heating. If that doesn't work, destructive means may be called for. Heavy wrenching will likely deform the bolt threads, necessitating replacement anyway. A wing nut in a liquid state has no holding power.
I have been afraid to try that. I would feel better if anyone here on PF said they have seen this before. Otherwise it seems like clicking links in unsolicited emails.
I don't know. I'm seeing this on my PC, not on my (android) phone. When the popup appears, I just use the "back" button and it disappears for a day or two.
RIP Syd!
If you like the pre-Dark Side Floyd, check out the Nick Mason videos on youtube. He was (is?) touring under the 'Saucer Full of Secrets' name.