Add link to Firefox source file.

diff --git a/docs/index.md b/docs/index.md
index edf6a7b71a9aed273b55219d2e846ab8174b5e79..51cb08a2d8a61ae4c9ff8afa0c7ee35f96dd978a 100644 (file)
--- a/docs/index.md
+++ b/docs/index.md
@@ -5313,6 +5313,8 @@ Set and lock preferences.
 
 Previously you could only set and lock a subset of preferences. Starting with Firefox 81 and Firefox ESR 78.3 you can set many more preferences. You can also set default preferences, user preferences and you can clear preferences.
 
 
 Previously you could only set and lock a subset of preferences. Starting with Firefox 81 and Firefox ESR 78.3 you can set many more preferences. You can also set default preferences, user preferences and you can clear preferences.
 

+**NOTE** There are too many preferences for us to provide documentation on them all. The source file [StaticPrefList.yaml](https://searchfox.org/mozilla-central/source/modules/libpref/init/StaticPrefList.yaml) contains information on many of them.
+

 Preferences that start with the following prefixes are supported:
 ```
 accessibility.
 Preferences that start with the following prefixes are supported:
 ```
 accessibility.