By default, Firefox disables the installation of 3rd party add-ons, including
language packs. We want to enable language packs by default, so set 
this to enable add-ons that are bundled with Firefox but will still disable 
third-party add-ons for security.
Solaris specific patch, will not send upstream.

--- gecko-dev-b189986e26a92f749462094e7869771c1a6607c0/browser/app/profile/firefox.js.~2~	2024-03-12 13:35:29.200245592 -0400
+++ gecko-dev-b189986e26a92f749462094e7869771c1a6607c0/browser/app/profile/firefox.js	2024-03-12 13:45:08.565491400 -0400
@@ -58,7 +58,7 @@
 
 // Disable add-ons that are not installed by the user in all scopes by default.
 // See the SCOPE constants in AddonManager.sys.mjs for values to use here.
-pref("extensions.autoDisableScopes", 15);
+pref("extensions.autoDisableScopes", 11);
 // Scopes to scan for changes at startup.
 pref("extensions.startupScanScopes", 0);