diff --git a/4.1-Extensions.md b/4.1-Extensions.md
index ef7e538..38cf1bc 100644
--- a/4.1-Extensions.md
+++ b/4.1-Extensions.md
@@ -4,7 +4,7 @@ Also, see [this sticky issue](https://github.com/ghacksuserjs/ghacks-user.js/iss
 
 If you would like to submit a privacy or security related extension to be added to this list, please post the details [here](https://github.com/ghacksuserjs/ghacks-user.js/issues/655) for consideration, thanks.
 
-:exclamation: **CSP**: When multiple extensions use CSP header injection, **only one wins** and predicting the winner is like [rolling a dice](https://github.com/ghacksuserjs/ghacks-user.js/issues/265#issuecomment-393935989). Also see [#497](https://github.com/ghacksuserjs/ghacks-user.js/issues/497). **Some** CSP items to be aware of are highlighted below.
+:exclamation: **CSP**: When multiple extensions use CSP header injection, **only one wins** and predicting the winner is like [rolling a dice](https://github.com/ghacksuserjs/ghacks-user.js/issues/265#issuecomment-393935989). Also see [#497](https://github.com/ghacksuserjs/ghacks-user.js/issues/497) and [1421725](https://bugzilla.mozilla.org/show_bug.cgi?id=1421725) (one of many bugzillas). **Some** CSP items to be aware of are highlighted below.
 
 ### :small_orange_diamond: Extensions
 These are all, where applicable, best configured to `deny-all` and whitelist.