diff --git a/package-lock.json b/package-lock.json
index 2db5a6b..1b42dde 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6010,6 +6010,12 @@
       "integrity": "sha1-wFTor02d11205jq8dviFFocU1LM=",
       "dev": true
     },
+    "@types/firefox-webext-browser": {
+      "version": "82.0.0",
+      "resolved": "https://registry.npmjs.org/@types/firefox-webext-browser/-/firefox-webext-browser-82.0.0.tgz",
+      "integrity": "sha512-zKHePkjMx42KIUUZCPcUiyu1tpfQXH9VR4iDYfns3HvmKVJzt/TAFT+DFVroos8BI9RH78YgF3Hi/wlC6R6cKA==",
+      "dev": true
+    },
     "@types/glob": {
       "version": "7.1.3",
       "resolved": "https://registry.npmjs.org/@types/glob/-/glob-7.1.3.tgz",
diff --git a/package.json b/package.json
index 594781b..b829a62 100644
--- a/package.json
+++ b/package.json
@@ -51,6 +51,7 @@
   "devDependencies": {
     "@types/chrome": "0.0.128",
     "@types/copy-webpack-plugin": "^6.4.0",
+    "@types/firefox-webext-browser": "^82.0.0",
     "@types/jest": "^26.0.20",
     "@types/jquery": "^3.5.5",
     "@types/node": "^14.14.20",