fix: register listeners sync

[reneaaron]

Describe the changes you have made in this PR

Possibly fixes #2305 🤞

MV3 Migration Guide

[github-actions]

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[rolznz]

@reneaaron nice! I think this fixes this particular issue. I am just worried about what will happen if we receive requests while the init() function is still running, which might introduce strange errors. I still think it would be good to wait for the service worker / background script to finish the init() before we start interacting with it.

CC @bumi

[reneaaron]

I am just worried about what will happen if we receive requests while the init() function is still running, which might introduce strange errors. I still think it would be good to wait for the service worker / background script to finish the init() before we start interacting with it.

What would we do with messages that are sent before init() finished then? Drop them? Couldn't that lead to other problems? (promises not being resolved, etc?)

[rolznz]

I am just worried about what will happen if we receive requests while the init() function is still running, which might introduce strange errors. I still think it would be good to wait for the service worker / background script to finish the init() before we start interacting with it.

What would we do with messages that are sent before init() finished then? Drop them? Couldn't that lead to other problems? (promises not being resolved, etc?)

@reneaaron this fixes the issue for me and was just raising the possibility of other issues, but I can't produce them. I think we should merge this 🚀

[bumi]

I don't think it is possible to easily handle messages sent before the init is done.