revert(firefox): abandon tridactyl dynamic newtab, use extension

Returned to using New Tab Override extension with Tridactyl yielding control via 'set newtab about:newtab'. This proved most reliable.

apps/firefox/default.nix

@@ -39,8 +39,8 @@
     bind K tabprev
     unbind <C-e>
 
-    " Modular NewTab: Detect profile by initial URL and set newtab accordingly
+    " Force Tridactyl to yield new tab control to Firefox/Extensions
-    js tri.browser.tabs.query({active: true, currentWindow: true}).then(tabs => { if (tabs.length > 0) { const url = tabs[0].url; if (url.includes("youtube.com")) { tri.config.set("newtab", "https://youtube.com"); } } })
+    set newtab about:newtab
   '';
 
   programs.firefox = {