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pref("plugins.hide_infobar_for_missing_plugin", true);

• dead pref? hxxps://dxr.mozilla.org/mozilla-esr60/search?q=hide_infobar_for_missing_plugin -> 0 results found

pref("plugins.hideMissingPluginsNotification", true);

• dead pref? hxxps://dxr.mozilla.org/mozilla-esr60/search?q=hideMissingPluginsNotification -> 0 results found

pref("plugin.expose_full_path", false);

• dead pref? hxxps://dxr.mozilla.org/mozilla-esr60/search?q=expose_full_path -> 0 results found

unless you have custom code that re-implements this I don't think the pref does anything anymore: pref("dom.mozTCPSocket.enabled", false);

• hxxps://dxr.mozilla.org/mozilla-esr60/search?q=mozTCPSocket

pref("browser.usedOnWindows10", true);

• dead pref? hxxps://hg.mozilla.org/mozilla-central/rev/5dd17564f294 -> also uplifted to FF50
• hxxps://dxr.mozilla.org/mozilla-esr60/search?q=usedOnWindows10 -> 2 remnants for .introURL but nothing for "browser.usedOnWindows10"

pref("browser.selfsupport.enabled", false); pref("browser.selfsupport.url", "");

• both removed in FF55 -> https://bugzilla.mozilla.org/1361578
• hxxps://dxr.mozilla.org/mozilla-esr60/search?q=browser.selfsupport -> 0 results
• hxxps://dxr.mozilla.org/mozilla-esr60/search?q=selfsupport -> 8 results but nothing that looks related to these 2 prefs

pref("browser.newtabpage.directory.ping", "data:text/plain,");

• dead pref? removed in FF55: https://bugzilla.mozilla.org/1241390

pref("browser.newtabpage.directory.source", "data:text/plain,"); pref("browser.newtabpage.enhanced", false); pref("browser.newtabpage.introShown", true);

• all 3 were removed in FF60: https://bugzilla.mozilla.org/buglist.cgi?bug_id=1370930,1433133

pref("browser.newtabpage.remote", false);

• last remnants removed in FF60 (https://bugzilla.mozilla.org/1355166)

Trac:
Username: rzb