Fix addon installation for Firefox 74

regressed by: Bug 1524327

2 files changed, 5 insertions, 2 deletions

diff --git a/README b/README
index 40d4c31..8f58709 100644
--- a/README
+++ b/README
@@ -20,4 +20,4 @@ trademark; you are not granted any right to distribute modified binary versions
 of the software containing the official branding.
 
 (C) 2018-2019 Mozilla, MPL v2
-(C) 2019 //gir.st/, MPL v2
+(C) 2019-2020 //gir.st/, MPL v2
diff --git a/config.js b/config.js
index 98e6a6f..3fc8f1b 100644
--- a/config.js
+++ b/config.js
@@ -1,11 +1,14 @@
 // keep this comment
 try {
   let Xdb = Cu.import('resource://gre/modules/addons/XPIDatabase.jsm', {});
+  Xdb.XPIDatabase.isDisabledLegacy = (addon) => false;
   Xdb.XPIDatabase['SIGNED_TYPES'].clear();
   Xdb.AddonSettings = {
     "REQUIRE_SIGNING": false,
     "LANGPACKS_REQUIRE_SIGNING": false,
-    "ALLOW_LEGACY_EXTENSIONS": true,
+    "ALLOW_LEGACY_EXTENSIONS": true, // <=fx73
+    "EXPERIMENTS_ENABLED": true, // >=fx74
+    "DEFAULT_THEME_ID": "default-theme@mozilla.org",
   };
 
   const {FileUtils} = Cu.import('resource://gre/modules/FileUtils.jsm');