This hubbub is all irrelevant.
Nevertheless one place checks MOZ_APP_VERSION
So you can fix this
diff --git a/chrome/custombuttons/content/SelfHelper/SelfHelper.jsm b/chrome/custombuttons/content/SelfHelper/SelfHelper.jsm
index 8e009ac..42807e7 100644
--- a/chrome/custombuttons/content/SelfHelper/SelfHelper.jsm
+++ b/chrome/custombuttons/content/SelfHelper/SelfHelper.jsm
@@ -52,7 +52,7 @@ var AC, SelfHelper = {
this.platform = ["win", "linux", "macosx"]
.includes(platform) ? platform : "linux";
- this.version = parseInt(AppConstants.MOZ_APP_VERSION);
+ this.version = 74;
if (this.version >= 95) {
var pref = "extensions.custombuttons.prefersColorSchemeOverride";
var pb = Cc["@mozilla.org/preferences-service;1"].getService(Ci.nsIPrefBranch);
I shall think out what to do with the version discord.