Staff member
Now that Firefox stable is version 81 and ESR been pushed with version 78.3, question:
Which version you use?

Version 80 and 81 has new features that ESR doesnt have

Note however that ESR does have bug fixes.

i.e, the new ESR release contains:
  • Fixed a bug on Windows for ESR releases: "On Windows, when loading a LNK file via a local file, the link was not redirected to the target".
For the list of fixes in both 81 and ESR versions, go here:

I personally been using ESR since 68