[walrus01]

It's the duty and responsibility of a properly implemented browser to not allow a "website" to break basic UI functionality because it pushes some javascript. I don't care about how Safari and chrome and edge do it. Firefox should not follow their lead.

This is a fine example of why people install plugins like ublock origin and similar.

[db48x]

Firefox does it best here, because you can hold shift to get the original context menu back when the page blocks it or provides their own.

[freedomben]

Exactly. There are legitimate use cases for hijacking the right-click menu to make it better. For example, Google docs, GMail, etc. The best solution IMHO is the shift key to get the normal menu. It's the best of both worlds.