It appears that there is a 'load' event for tabs on Firefox but this is not documented.
Duplicate of this bug: 904965
Is that different to this: https://addons.mozilla.org/en-US/developers/docs/sdk/latest/modules/sdk/tabs.html#load?
Ahh I was looking at the online docs, my bad.
Status: NEW → RESOLVED
Last Resolved: 5 years ago
Resolution: --- → WORKSFORME
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