diff --git a/.gitignore b/.gitignore
index 5148e52..50f512b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,6 +8,9 @@ pids
 *.pid
 *.seed
 
+# Storm idea folder
+.idea
+
 # Directory for instrumented libs generated by jscoverage/JSCover
 lib-cov
 
diff --git a/README.md b/README.md
index f158984..09da9ae 100644
--- a/README.md
+++ b/README.md
@@ -41,21 +41,21 @@ onKeyPress = (ev) => {
 
 ## Usage
 
-To use this module, import the `Key` enum at the top of your TypeScript file using the enum:
+To use this module, import the `Key` or `FirefoxKey` (if you support firefox browser) enum at the top of your TypeScript file using the enum:
 
 ```JavaScript
-import { Key } from 'ts-keycode-enum';
+import { Key, FirefoxKey } from 'ts-keycode-enum';
 ```
 
 You can now use a readable enum value in place of any raw keycodes throughout the file:
 
 ```JavaScript
-if (ev.which === Key.Escape) { ... }
+if (ev.which === Key.SemiColon || ev.which === FirefoxKey.SemiColon) { ... }
 ```
 
-See [Key.enum.ts](./Key.enum.ts) for a complete list of available keys.
+See [Key.enum.ts](./src/Key.enum.ts) and [FirefoxKey.enum.ts](./src/FirefoxKey.enum.ts) for a complete list of available keys.
 
-In addition, to aid with readability, a number of enum values have aliases.  For example:
+In addition, to aid with readability, a number of enum values have aliases. For example:
 
 ```JavaScript
 // this  true - these values are equal
diff --git a/dist/declarations/FirefoxKey.enum.d.ts b/dist/declarations/FirefoxKey.enum.d.ts
new file mode 100644
index 0000000..2c649a6
--- /dev/null
+++ b/dist/declarations/FirefoxKey.enum.d.ts
@@ -0,0 +1,7 @@
+export declare enum FirefoxKey {
+    SemiColon = 59,
+    Equals = 61,
+    Dash = 173,
+    UnderScore = 173,
+    PlusSign = 61
+}
diff --git a/dist/declarations/index.d.ts b/dist/declarations/index.d.ts
new file mode 100644
index 0000000..cea510a
--- /dev/null
+++ b/dist/declarations/index.d.ts
@@ -0,0 +1,2 @@
+export { Key } from './Key.enum';
+export { FirefoxKey } from './FirefoxKey.enum';
diff --git a/dist/js/FirefoxKey.enum.js b/dist/js/FirefoxKey.enum.js
new file mode 100644
index 0000000..20ce57f
--- /dev/null
+++ b/dist/js/FirefoxKey.enum.js
@@ -0,0 +1,10 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+var FirefoxKey;
+(function (FirefoxKey) {
+    FirefoxKey[FirefoxKey["SemiColon"] = 59] = "SemiColon";
+    FirefoxKey[FirefoxKey["Equals"] = 61] = "Equals";
+    FirefoxKey[FirefoxKey["Dash"] = 173] = "Dash";
+    FirefoxKey[FirefoxKey["UnderScore"] = 173] = "UnderScore";
+    FirefoxKey[FirefoxKey["PlusSign"] = 61] = "PlusSign";
+})(FirefoxKey = exports.FirefoxKey || (exports.FirefoxKey = {}));
diff --git a/dist/js/index.js b/dist/js/index.js
new file mode 100644
index 0000000..4606e6e
--- /dev/null
+++ b/dist/js/index.js
@@ -0,0 +1,6 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+var Key_enum_1 = require("./Key.enum");
+exports.Key = Key_enum_1.Key;
+var FirefoxKey_enum_1 = require("./FirefoxKey.enum");
+exports.FirefoxKey = FirefoxKey_enum_1.FirefoxKey;
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..c41362c
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,14 @@
+{
+  "name": "ts-keycode-enum",
+  "version": "1.0.6",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "typescript": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.1.1.tgz",
+      "integrity": "sha512-Veu0w4dTc/9wlWNf2jeRInNodKlcdLgemvPsrNpfu5Pq39sgfFjvIIgTsvUHCoLBnMhPoUA+tFxsXjU6VexVRQ==",
+      "dev": true
+    }
+  }
+}
diff --git a/package.json b/package.json
index 44bc4dc..e7e88c5 100644
--- a/package.json
+++ b/package.json
@@ -2,11 +2,14 @@
   "name": "ts-keycode-enum",
   "version": "1.0.6",
   "description": "A TypeScript enum definition that maps human-friendly key names to JavaScript key codes",
-  "main": "dist/js/Key.enum.js",
+  "main": "dist/js/index.js",
   "files": [
     "dist/"
   ],
-  "types": "dist/declarations/Key.enum.d.ts",
+  "types": [
+    "dist/declarations/Key.enum.d.ts",
+    "dist/declarations/FirefoxKey.enum.d.ts"
+  ],
   "scripts": {
     "build": "tsc"
   },
@@ -20,6 +23,7 @@
     "keycodes",
     "key",
     "enum",
+    "firefox",
     "ts"
   ],
   "author": {
@@ -33,6 +37,6 @@
   },
   "homepage": "https://github.com/nfriend/ts-keycode-enum#readme",
   "devDependencies": {
-    "typescript": "^2.9.2"
+    "typescript": "^3.1.1"
   }
 }
diff --git a/src/FirefoxKey.enum.ts b/src/FirefoxKey.enum.ts
new file mode 100644
index 0000000..d5ff76b
--- /dev/null
+++ b/src/FirefoxKey.enum.ts
@@ -0,0 +1,7 @@
+export enum FirefoxKey {
+    SemiColon = 59,
+    Equals = 61,
+    Dash = 173,
+    UnderScore = Dash,
+    PlusSign = Equals,
+}
diff --git a/Key.enum.ts b/src/Key.enum.ts
similarity index 99%
rename from Key.enum.ts
rename to src/Key.enum.ts
index ad8d986..364ad1c 100644
--- a/Key.enum.ts
+++ b/src/Key.enum.ts
@@ -124,4 +124,4 @@ export enum Key {
     OpenBracket = 219,
     ClosedBracket = 221,
     Quote = 222
-}
\ No newline at end of file
+}
diff --git a/src/index.ts b/src/index.ts
new file mode 100644
index 0000000..2c08023
--- /dev/null
+++ b/src/index.ts
@@ -0,0 +1,2 @@
+export {Key} from './Key.enum';
+export {FirefoxKey} from './FirefoxKey.enum';
diff --git a/tsconfig.json b/tsconfig.json
index 538892e..48137d3 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,12 +1,12 @@
 {
-    "compilerOptions": {
-        "declaration": true,
-        "declarationDir": "dist/declarations",
-        "module": "commonjs",
-        "target": "es5",
-        "outDir": "dist/js"
-    },
-    "files": [
-        "Key.enum.ts"
-    ]
-}
\ No newline at end of file
+  "compilerOptions": {
+    "declaration": true,
+    "declarationDir": "dist/declarations",
+    "module": "commonjs",
+    "target": "es5",
+    "outDir": "dist/js"
+  },
+  "include": [
+    "src/**/*"
+  ]
+}