feat: specify add-on id (#192)

Author: ignatiusmb

static/.web-extension-id

@@ -27,5 +27,12 @@
 	"devtools_page": "register.html",
 	"host_permissions": ["*://*/*"],
 	"permissions": ["activeTab", "scripting"],
-	"web_accessible_resources": [{ "matches": ["*://*/*"], "resources": ["courier.js"] }]
+	"web_accessible_resources": [{ "matches": ["*://*/*"], "resources": ["courier.js"] }],
+
+	"browser_specific_settings": {
+		"gecko": {
+			"id": "[email protected]",
+			"strict_min_version": "121.0"
+		}
+	}
 }