feat(firefox): implement robust modular newtab logic

Uses a shell-based environment check in tridactylrc to set the newtab URL dynamically, allowing per-profile overrides without hardcoding URLs.

apps/firefox/default.nix

@@ -16,7 +16,7 @@
     ];
 
     workspace = [
-      "special:youtube, on-created-empty:uwsm app -- env TRIDACTYL_NEWTAB=https://youtube.com firefox -P YouTube --name youtube"
+      "special:youtube, on-created-empty:env TRIDACTYL_NEWTAB=https://youtube.com firefox -P YouTube --name youtube"
     ];
 
     windowrulev2 = [
@@ -39,8 +39,9 @@
     bind K tabprev
     unbind <C-e>
 
-    " Set newtab from environment variable if available (provided by native messenger)
-    js tri.native.run("printenv TRIDACTYL_NEWTAB").then(r => { if (r.stdout.trim()) tri.config.set("newtab", r.stdout.trim()) })
+    " Modular NewTab: Set from environment variable if provided by launch command
+    " Note: Uses 'r.content' for native command output
+    js tri.native.run("sh -c 'echo $TRIDACTYL_NEWTAB'").then(r => { let url = r.content.trim(); if (url) { tri.config.set("newtab", url); console.log("Tridactyl: Set newtab to " + url); } }).catch(e => console.error("Tridactyl NewTab Env Error:", e))
   '';
 
   programs.firefox = {

apps/firefox/profiles/web-app.nix

@@ -7,6 +7,8 @@
   ...
 }: {
   inherit id name;
+  # Note: This profile relies on the global tridactylrc logic in default.nix
+  # to dynamically set 'newtab' via the TRIDACTYL_NEWTAB environment variable.
   search.force = true;
   search.default = "ddg";
   extensions.force = true;