Clicks being captured by website

[zakius]

Describe the bug
Not sure if something changed in your code recently or webdevs managed to find a way around your extension but I just encountered website that captures even right click and performs own action. Interestingly on Waterfox Classic middle-clicking causes background page to open despite non-standard action being performed while on Quantumfox only non-standard happens
To Reproduce
Steps to reproduce the behavior:

1. Go to https://www.pyszne.pl/restauracja-gdansk-gdansk-80-300 (should show the list of restaurants)
2. Click on restaurant name with non-primary mouse button
3. Restaurant menu will open in current tab (and possibly in background too depending on exact browser version)

Browser (please complete the following information):

• OS: Win10
• Browser Waterfox Classic 2020.02.1 and Firefox 72

Additional context
Ctrl+click works as expected

I may try debugging this further later, will post solution if I find one

[zakius]

on Quantumfox 74 (testing on another machine) click event registered in the extension isn't even triggered when clicking with middle or right button, in Waterfox Classic it is triggered but the one bound by website still happens

I am completely lost, tried handling also mouseup events and things like that yet I never managed to prevent their events from happening