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How to prevent redirect with web extension?

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Hi, I want to do firefox web extension to prevent redirect. F.e.: I wait urls like https://A, but when this A url load, it 302 redirect to https://B, and the extension don't run because we are on B url, not A. I don't know B url and it can be different each time. content_scripts.run_at.document_start wait until request is done and don't help. Can I resolve my problem with web extension? Or I must try other thing?

Hi, I want to do firefox web extension to prevent redirect. F.e.: I wait urls like https://A, but when this A url load, it 302 redirect to https://B, and the extension don't run because we are on B url, not A. I don't know B url and it can be different each time. content_scripts.run_at.document_start wait until request is done and don't help. Can I resolve my problem with web extension? Or I must try other thing?

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It's better to ask about it on discourse.

Addon devs are sitting there :).