Thanks for your awesomeness.
Would it be possible to update the page where you describe the certificate compatibility with the OS & Browser versions ?
The page in question : https://letsencrypt.org/fr/docs/certificate-compatibility/
For example, the page indicates that LE certificates are compatible with Mozilla Firefox >= v2.0, but that will no longer be the case next september when the root ca certificate "DST Root CA X3" expires. If I understand correctly it will be compatible with Firefox >= v50.0 (first version to integrate ISRG Root CA X11 in its truststore by default).
Same goes for Android, as you describe on this page : https://letsencrypt.org/2020/11/06/own-two-feet.html
It would be great to be able to tell which OS / Brower version will stay compatible next september.
This post relates to Compatibility list for ISRG Root X1?.