allow about:debugging

allow-debugging.patch

@@ -0,0 +1,19 @@
+--- a/browser/components/enterprisepolicies/Policies.sys.mjs
++++ b/browser/components/enterprisepolicies/Policies.sys.mjs
+@@ -1137,8 +1137,6 @@ export var Policies = {
+             "extensions.htmlaboutaddons.recommendations.enable",
+             false
+           );
+-          // Block about:debugging
+-          blockAboutPage(manager, "about:debugging");
+         }
+         if ("restricted_domains" in extensionSettings["*"]) {
+           let restrictedDomains = Services.prefs
+@@ -1450,7 +1448,6 @@ export var Policies = {
+       if ("Default" in param) {
+         setAndLockPref("xpinstall.enabled", param.Default);
+         if (!param.Default) {
+-          blockAboutPage(manager, "about:debugging");
+           setAndLockPref(
+             "browser.newtabpage.activity-stream.asrouter.userprefs.cfr.addons",
+             false

flake.nix

@@ -27,6 +27,11 @@
           # restriction.
           # https://github.com/mozilla/policy-templates/issues/484
           ./allow-searchengines-policy.patch
+
+          # Firefox disables about:debugging when manual addon
+          # installation is disabled by policy, since it can be used
+          # to sideload. I want managed addons *and* debugging.
+          ./allow-debugging.patch
         ];
       });
     };