Fix dev setup for Firefox

An issue in the web-ext package was preventing Firefox from opening in
development. Upgrading the package fixed the problem.

For reference, see mozilla/web-ext#2975

Author: klappradla

package.json

@@ -79,7 +79,7 @@
     "stylelint-junit-formatter": "^0.2.2",
     "stylelint-prettier": "^1.2.0",
     "typescript": "^4.4.2",
-    "web-ext": "^7.6.0",
+    "web-ext": "^7.11.0",
     "webpack": "5.76.0",
     "webpack-chain": "6.5.1",
     "webpack-cli": "^5.0.1",