removed uneccessary permissions

manifest.json

@@ -5,8 +5,6 @@
     "options_page": "options.html",
     "description": "Improves the course registration process at the University of Texas at Austin!",
     "permissions": [
-        "tabs",
-        "declarativeContent",
         "storage",
         "*://*.utdirect.utexas.edu/apps/registrar/course_schedule/*",
         "*://*.utexas.collegescheduler.com/*",