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How to find the user ID of a firefox account in order to install an addon collection?

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I am trying to install an addon collection for firefox nightly that I created. In order to do so, I need to enter the User ID of the collection owner (so my User ID) and the name of the collection. I do not know where to find my User ID though. At first I thought this was my username but the User ID consists of just numbers. Can someone tell me where I can find my User ID? Thanks in advance!

I am trying to install an addon collection for firefox nightly that I created. In order to do so, I need to enter the User ID of the collection owner (so my User ID) and the name of the collection. I do not know where to find my User ID though. At first I thought this was my username but the User ID consists of just numbers. Can someone tell me where I can find my User ID? Thanks in advance!

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Could you take a look at the first large screenshot in this article:

https://blog.mozilla.org/addons/2020/09/29/expanded-extension-support-in-firefox-for-android-nightly/

Can you find that number? It seems to be the one in the URL of the collection which you can open from the My Collections page:

https://addons.mozilla.org/firefox/collections/