BYOB fails when adding collections
Cannot add personal collection URL to Build Your Own Browser website. Clicking "Review and Build" button returns "Invalid URL for addon collection" error.
Collections tab of BYOB has the word "collection" in the example URL. The URL for my addon collection has the word "collections". If I leave "collections" in the URL, the review/build fails with the error above. If I change the URL to have the word "collection", the review/build passes, but now the actual URL is invalid.
Opaite Mbohovái (1)
I had the same problem and the solution was simply deleting some elements from the original link.
For example:
Instead of: https://addons.mozilla.org/es-ES/firefox/collections/mozilla/webdeveloper/
Use: https://addons.mozilla.org/en-us/firefox/collection/webdeveloper/
Moambuepyre