firefox{,-bin}, thunderbird{,-bin}: Set meta.changelog

pkgs/applications/networking/browsers/firefox-bin/default.nix

@@ -204,6 +204,7 @@ stdenv.mkDerivation {
         else "https://archive.mozilla.org/pub/firefox/releases/";
   };
   meta = with lib; {
+    changelog = "https://www.mozilla.org/en-US/firefox/${version}/releasenotes/";
     description = "Mozilla Firefox, free web browser (binary package)";
     homepage = "https://www.mozilla.org/firefox/";
     license = licenses.mpl20;

pkgs/applications/networking/browsers/firefox/packages.nix

@@ -10,6 +10,7 @@ rec {
     };
 
     meta = {
+      changelog = "https://www.mozilla.org/en-US/firefox/${version}/releasenotes/";
       description = "A web browser built from Firefox source tree";
       homepage = "http://www.mozilla.com/en-US/firefox/";
       maintainers = with lib.maintainers; [ lovesegfault hexa ];
@@ -36,6 +37,7 @@ rec {
     };
 
     meta = {
+      changelog = "https://www.mozilla.org/en-US/firefox/${lib.removeSuffix "esr" version}/releasenotes/";
       description = "A web browser built from Firefox Extended Support Release source tree";
       homepage = "http://www.mozilla.com/en-US/firefox/";
       maintainers = with lib.maintainers; [ hexa ];

pkgs/applications/networking/mailreaders/thunderbird-bin/default.nix

@@ -205,6 +205,7 @@ stdenv.mkDerivation {
   };
 
   meta = with lib; {
+    changelog = "https://www.thunderbird.net/en-US/thunderbird/${version}/releasenotes/";
     description = "Mozilla Thunderbird, a full-featured email client (binary package)";
     homepage = "http://www.mozilla.org/thunderbird/";
     sourceProvenance = with sourceTypes; [ binaryNativeCode ];

pkgs/applications/networking/mailreaders/thunderbird/packages.nix

@@ -19,6 +19,7 @@ rec {
     ];
 
     meta = with lib; {
+      changelog = "https://www.thunderbird.net/en-US/thunderbird/${version}/releasenotes/";
       description = "A full-featured e-mail client";
       homepage = "https://thunderbird.net/";
       maintainers = with maintainers; [ eelco lovesegfault pierron vcunat ];