firefox: prepare for updated sideloading behavior

Co-Authored-By: Cole Helbling <cole.e.helbling@outlook.com>

1 files changed, 26 insertions, 0 deletions

diff --git a/modules/misc/news.nix b/modules/misc/news.nix
index 6a5cce7e085..9fe4f59af98 100644
--- a/modules/misc/news.nix
+++ b/modules/misc/news.nix
@@ -1381,6 +1381,32 @@ in
           A new module is available: 'services.lieer'.
         '';
       }
+
+      {
+        time = "2020-03-15T16:55:28+00:00";
+        condition = config.programs.firefox.enable;
+        message = ''
+          In anticipation of Firefox dropping support for extension
+          sideloading[1], we now install extensions directly to
+          Firefox profiles managed through Home Manager's
+
+            'programs.firefox.profiles'
+
+          option.
+
+          Unfortunately this will most likely trigger an "Existing
+          file is in the way" error when activating your configuration
+          since Firefox keeps a copy of the add-on in the location
+          Home Manager wants to overwrite. If this is the case, remove
+          the listed '.xpi' files and try again.
+
+          This change also means that extensions installed through
+          Home Manager may disappear from unmanaged profiles in future
+          Firefox releases.
+
+          [1] https://blog.mozilla.org/addons/2019/10/31/firefox-to-discontinue-sideloaded-extensions/
+        '';
+      }
     ];
   };
 }