@elmaruser I did not in any way imply that I use Boolean logic. I was trying to convey that AV programs use it, and this leads to non-identical action from one environment to another. "No one can reproduce..." is merely an indication that the relevant variable is in the environment (your system) rather than in the software.
Avast! and others make up their mind, almost arbitrarily, what to block and what to permit. It is not possible to design software in accordance with the arbitrary rules of various security programs. Rather, security software has to figure out how to safeguard without messing up a user's system and preferred applications. As, to date, no software on the market has ever figured this out 100%, I quit using it over a decade ago and therefore have fewer problems than people who use it. But YMMV. Some people feel naked with an AV and an anti-execution suite. For them, we just have to try to let them know what factors may be affecting their experience.
I hope your experience with Vivaldi continues to be positive over all! 🙂