Re-enable add-on installed as an update/fix by installer

Hello,

We are currently facing the following problem with Firefox Nightly 56 (the 07/18 build):
an old add-on was disabled by FF nightly because it was not mpc compatible.
Then we fixed the pb and install the new add-on version by our installer.

when we launch Firefox, the add-on has no nore red warning but remains disabled.

We would like the installer to re-enable the new version so that the user
does not need to do it manually.

Which files (in the user profile folder) control the enabling add-on feature on Firefox nightly ?

We tried to patch the extensions.json file; it doesn’t make any changes.

thanks for your help.