ping @yyx990803 , tested and worked

Confirmed to work well.

Or you can just provide a link to download from.

Please sign the addon and offer an official version. Chrome Store Foxified is for addon developers not for users.

If you wish to host your own addon you need to provide a special Content-Type with the vaule application/x-xpinstall. Github pages does this by default.

If you have issues with "duplicate extension ID" then you need to replace the ID in the manifest with a new UUID.

json "applications": { "gecko": { "id": "nhdogjmejiglipccpnnnanhbledajbpd@chrome-store-foxified-unsigned" } }
with something like
json "applications": { "gecko": { "id": "{57139B66-10D1-11E7-9FAB-1EC5A0406E17}" } }
The IDs can be generated from here or with plain old GNU Bash echo uuidgen | head -c-1. Don't forget the {}in{57139B66-10D1-11E7-9FAB-1EC5A0406E17}`.

If you wish to sign the addon as part of your build you can use web-ext sign.

What I posted above is an unlisted addon. More info here and the review policies are here.

The supported APIs are here and APIs bugs that you can follow are here.

Please provide a listed addon. One that appears in AMO. :D

@andreicristianpetcu Thank you for the detailed explanation. I was wondering about the Id part but was unable to figure out how to tackle. So then I thought that for the time being let the users create their own id by signing the extension for their own use.

Just be sure that if you change the ID then Firefox will see it as a different addon. So try to pick an UUID and stick with it. You can use different ones if you have issues while signing it the first time.