Update user.js (#676)

- to avoid confusion with the setting tag, split the prefs into separate numbers, thus shove 2031->2031, reuse 2031
- remove the default value notation as Mozilla will roll out default change gradually to users

user.js

@@ -117,6 +117,7 @@ user_pref("browser.newtabpage.activity-stream.feeds.snippets", false);
 user_pref("browser.newtabpage.activity-stream.feeds.section.topstories", false);
 user_pref("browser.newtabpage.activity-stream.section.highlights.includePocket", false);
 user_pref("browser.newtabpage.activity-stream.showSponsored", false);
+user_pref("browser.newtabpage.activity-stream.feeds.discoverystreamfeed", false); // [FF66+]
 /* 0105d: disable Activity Stream recent Highlights in the Library [FF57+] ***/
    // user_pref("browser.library.activity-stream.enabled", false);
 /* 0110: start Firefox in PB (Private Browsing) mode
@@ -1079,11 +1080,13 @@ user_pref("dom.imagecapture.enabled", false); // [DEFAULT: false]
  * [1] https://developer.mozilla.org/docs/Web/API/OffscreenCanvas ***/
 user_pref("gfx.offscreencanvas.enabled", false); // [DEFAULT: false]
 /* 2030: disable autoplay of HTML5 media [FF63+]
- * 0=Allowed (default), 1=Blocked, 2=Prompt
+ * 0=Allowed, 1=Blocked, 2=Prompt
  * [NOTE] You can set exceptions under site permissions
  * [SETTING] Privacy & Security>Permissions>Block websites from automatically playing sound ***/
 user_pref("media.autoplay.default", 1);
-/* 2031: disable audio autoplay in non-active tabs [FF51+]
+/* 2031: disable autoplay of HTML5 media if you interacted with the site [FF66+] ***/
+user_pref("media.autoplay.enabled.user-gestures-needed", false);
+/* 2032: disable audio autoplay in non-active tabs [FF51+]
  * [1] https://www.ghacks.net/2016/11/14/firefox-51-blocks-automatic-audio-playback-in-non-active-tabs/ ***/
 user_pref("media.block-autoplay-until-in-foreground", true);