install.py: add support for macOS (#434)

As described in issue #438

Peskyfox.js

@@ -317,7 +317,6 @@ user_pref("browser.newtabpage.activity-stream.showSponsoredCheckboxes", false);
 //user_pref("browser.newtabpage.activity-stream.feeds.section.highlights", false); // Recent Activity [DEFAULT]
       //user_pref("browser.newtabpage.activity-stream.section.highlights.includeBookmarks", false);
       //user_pref("browser.newtabpage.activity-stream.section.highlights.includeDownloads", false);
-      //user_pref("browser.newtabpage.activity-stream.section.highlights.includePocket", false);
       //user_pref("browser.newtabpage.activity-stream.section.highlights.includeVisited", false);
 //user_pref("browser.newtabpage.activity-stream.feeds.snippets", false); // [DEFAULT]
 

install.py

@@ -65,6 +65,11 @@ INSTALLATIONS_TO_CHECK = [
         "command": ["flatpak", "run", "org.mozilla.firefox"],
         "root": Path.home().joinpath(".var/app/org.mozilla.firefox/.mozilla/firefox").absolute(),
     },
+    # macOS
+    {
+        "command": ["/Applications/Firefox.app/Contents/MacOS/firefox"],
+        "root": Path.home().joinpath("Library/Application Support/Firefox").absolute(),
+    },
 ]