diff --git a/package-lock.json b/package-lock.json
index 497b45e..fff28cd 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1488,12 +1488,37 @@
             "dev": true,
             "optional": true
         },
+        "@types/chrome": {
+            "version": "0.0.127",
+            "resolved": "https://registry.npmjs.org/@types/chrome/-/chrome-0.0.127.tgz",
+            "integrity": "sha512-hBB9EApLYKKn2GvklVkTxVP6vZvxsH9okyIRUinNtMzZHIgIKWQk/ESbX+O5g4Bihfy38+aFGn7Kl7Cxou5JUg==",
+            "dev": true,
+            "requires": {
+                "@types/filesystem": "*",
+                "@types/har-format": "*"
+            }
+        },
         "@types/color-name": {
             "version": "1.1.1",
             "resolved": "https://registry.npmjs.org/@types/color-name/-/color-name-1.1.1.tgz",
             "integrity": "sha512-rr+OQyAjxze7GgWrSaJwydHStIhHq2lvY3BOC2Mj7KnzI7XK0Uw1TOOdI9lDoajEbSWLiYgoo4f1R51erQfhPQ==",
             "dev": true
         },
+        "@types/filesystem": {
+            "version": "0.0.29",
+            "resolved": "https://registry.npmjs.org/@types/filesystem/-/filesystem-0.0.29.tgz",
+            "integrity": "sha512-85/1KfRedmfPGsbK8YzeaQUyV1FQAvMPMTuWFQ5EkLd2w7szhNO96bk3Rh/SKmOfd9co2rCLf0Voy4o7ECBOvw==",
+            "dev": true,
+            "requires": {
+                "@types/filewriter": "*"
+            }
+        },
+        "@types/filewriter": {
+            "version": "0.0.28",
+            "resolved": "https://registry.npmjs.org/@types/filewriter/-/filewriter-0.0.28.tgz",
+            "integrity": "sha1-wFTor02d11205jq8dviFFocU1LM=",
+            "dev": true
+        },
         "@types/glob": {
             "version": "7.1.3",
             "resolved": "https://registry.npmjs.org/@types/glob/-/glob-7.1.3.tgz",
@@ -1504,6 +1529,12 @@
                 "@types/node": "*"
             }
         },
+        "@types/har-format": {
+            "version": "1.2.5",
+            "resolved": "https://registry.npmjs.org/@types/har-format/-/har-format-1.2.5.tgz",
+            "integrity": "sha512-IG8AE1m2pWtPqQ7wXhFhy6Q59bwwnLwO36v5Rit2FrbXCIp8Sk8E2PfUCreyrdo17STwFSKDAkitVuVYbpEHvQ==",
+            "dev": true
+        },
         "@types/minimatch": {
             "version": "3.0.3",
             "resolved": "https://registry.npmjs.org/@types/minimatch/-/minimatch-3.0.3.tgz",
@@ -13115,6 +13146,12 @@
             "integrity": "sha512-2ham8XPWTONajOR0ohOKOHXkm3+gaBmGut3SRuu75xLd/RRaY6vqgh8NBYYk7+RW3u5AtzPQZG8F10LHkl0lAQ==",
             "dev": true
         },
+        "web-ext-types": {
+            "version": "3.2.1",
+            "resolved": "https://registry.npmjs.org/web-ext-types/-/web-ext-types-3.2.1.tgz",
+            "integrity": "sha512-oQZYDU3W8X867h8Jmt3129kRVKklz70db40Y6OzoTTuzOJpF/dB2KULJUf0txVPyUUXuyzV8GmT3nVvRHoG+Ew==",
+            "dev": true
+        },
         "which": {
             "version": "1.3.1",
             "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
diff --git a/package.json b/package.json
index 6ec0880..d32c98f 100644
--- a/package.json
+++ b/package.json
@@ -44,6 +44,7 @@
         "@babel/plugin-proposal-private-methods": "^7.12.1",
         "@babel/preset-env": "^7.12.11",
         "@babel/register": "^7.12.10",
+        "@types/chrome": "0.0.127",
         "babelify": "^10.0.0",
         "browserify": "^17.0.0",
         "cross-env": "^7.0.3",
@@ -74,6 +75,7 @@
         "tsify": "^5.0.2",
         "typescript": "^4.1.3",
         "vinyl-buffer": "^1.0.1",
-        "vinyl-source-stream": "^2.0.0"
+        "vinyl-source-stream": "^2.0.0",
+        "web-ext-types": "^3.2.1"
     }
 }
diff --git a/src/javascript/browserApi/storageProvider.ts b/src/javascript/browserApi/storageProvider.ts
index 0f84b1d..ff53fa8 100644
--- a/src/javascript/browserApi/storageProvider.ts
+++ b/src/javascript/browserApi/storageProvider.ts
@@ -1,15 +1,20 @@
 const { assigned } = require("../utils/helpers")
 
-class StorageProviderChromium {
+export interface ICustomBrowserStorageProvider {
+    setData(key: string, value: string): void;
+    getData(key: string, defaultValue: string, callback: (x: string) => void): void;
+}
 
-    setData(key, value) {
+class StorageProviderChromium implements ICustomBrowserStorageProvider {
+
+    setData(key: string, value: string): void {
         let obj = {};
         obj[key] = value;
 
         this.getStorage().set(obj);
     }
 
-    getData(key, defaultValue, callback) {
+    getData(key: string, defaultValue: string, callback: (x: string) => void): void {
         this.getStorage().get(key, items => {
             if (assigned(items) && assigned(items[key])) {
                 callback(items[key]);
@@ -20,7 +25,7 @@ class StorageProviderChromium {
         })
     }
 
-    getStorage() {
+    private getStorage(): chrome.storage.StorageArea {
         if (assigned(chrome.storage.sync)) {
             return chrome.storage.sync;
         }
@@ -30,21 +35,21 @@ class StorageProviderChromium {
 }
 
 
-class StorageProviderFirefox {
+class StorageProviderFirefox implements ICustomBrowserStorageProvider {
 
-    setData(key, value) {
+    setData(key: string, value: string): void {
         let obj = {};
         obj[key] = value;
 
         this.getStorage().set(obj);
     }
 
-    getData(key, defaultValue, callback) {
+    getData(key: string, defaultValue: string, callback: (x: string) => void): void {
         let promise = this.getStorage().get(key);
 
         promise.then(items => {
             if (assigned(items) && assigned(items[key])) {
-                callback(items[key]);
+                callback(items[key] as string);
             }
             else {
                 callback(defaultValue);
@@ -52,7 +57,7 @@ class StorageProviderFirefox {
         });
     }
 
-    getStorage() {
+    private getStorage(): browser.storage.StorageArea {
         if (assigned(browser.storage.sync)) {
             return browser.storage.sync;
         }
@@ -61,11 +66,13 @@ class StorageProviderFirefox {
     }
 }
 
-let __storageProvieder;
+let __storageProvieder: ICustomBrowserStorageProvider;
 
 function createStorageProvider() {
     // chrome based browser
-    if (assigned(chrome?.app)) {
+    // TODO: chrome.app?
+    // if (assigned(chrome?.app)) {        
+    if (true) {
         __storageProvieder = new StorageProviderChromium();
     }
     // firefox
@@ -75,7 +82,7 @@ function createStorageProvider() {
 
 }
 
-export function getGlobalStorageProvider() {
+export function getGlobalStorageProvider(): ICustomBrowserStorageProvider {
     if (!assigned(__storageProvieder)) {
         createStorageProvider();
     }
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..05d6614
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,6 @@
+{
+    "compilerOptions": {
+      // You have to explicitly set @types to get DefinitelyTyped type definitions
+      "typeRoots": ["node_modules/@types", "node_modules/web-ext-types"]
+    }
+  }
\ No newline at end of file