According to the Firefox Add-ons page, Conex version 0.5.24 requires Firefox 60.0a. On the other hand, the readme only mentions version 59.0a as a minimum requirement:
Conex uses a feature which only exists in Firefox >= 59.0a1 updated after the 19th of January 2018.
If there is an actual need to increase the minimum requirement, please state so in the readme, otherwise commit 2363fa8eb4651d4022019ac18468f1f350c6304f should be reverted.
If you want to enforce a maximum version requirement for Firefox you can use strict_max_version instead (see MDN).
According to the Firefox Add-ons page, Conex version 0.5.24 requires Firefox 60.0a. On the other hand, the readme only mentions version 59.0a as a minimum requirement:
If there is an actual need to increase the minimum requirement, please state so in the readme, otherwise commit 2363fa8eb4651d4022019ac18468f1f350c6304f should be reverted.
If you want to enforce a maximum version requirement for Firefox you can use
strict_max_versioninstead (see MDN).