How to set manifest V3 file when popup use fetch in firefox ver115?

[juraj.masiar]

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Regarding the issue - sadly, in MV3 in Firefox the host permissions needs to be manually granted by user:

[Blog post] Manifest v3 in Firefox: Recap & Next Steps

I think we chatted about this over matrix, but the issue is about host permissions, in MV3, they’re not granted automatically on install, but instead user needs to grant them at some point. Depending on what’s appropriate for your extension, you could ask the user using promise.request() , or they can grant it by going to about:addons, selecting your addon, and flipping the toggle in the permissions tab. We’re also working on an easier UI to do this, tied to your extension browser action, but…

You can use this API to ask user to grant the permissions:

permissions.request() - Mozilla | MDN