There were spurious error messages in the dev console of
uBO in Firefox, because Firefox does not silently ignore
duplicate contextual menu entries, which could occur
transiently when the contextual menu entries were updated.
The fix simplifies contextual menu code, and actually
fulfill the original goal of avoiding to call extensions
framework API as much as possible.
Related discussion:
- https://bugzilla.mozilla.org/show_bug.cgi?id=1652925
It's not clear the code here will fix the reported
issue, but I did identify that the subframe
dictionary of a very long-lived web page can
theoretically grow unbound.
These spurious error messages can occur when a
extension framework API method return a
rejected Promise. In uBO the results of
browserAction methods is not used so it can be
safely discarded.
Related feedback:
- https://www.reddit.com/r/uBlockOrigin/comments/d6zbqv/
For static filter `popup` filter purpose, the URL of the
embedded frame from which the popup was launched will
be used in the matching algorithm.
