diff --git a/__tests__/src/lib/list.spec.js b/__tests__/src/lib/model/list.spec.js
similarity index 89%
rename from __tests__/src/lib/list.spec.js
rename to __tests__/src/lib/model/list.spec.js
index 56210a4..6f402be 100644
--- a/__tests__/src/lib/list.spec.js
+++ b/__tests__/src/lib/model/list.spec.js
@@ -1,11 +1,12 @@
-import List from '../../../src/lib/model/list.js';
+import List from '../../../../src/lib/model/list.js';
 import {
   A_URL,
-  ANOTHER_URL,
+  URL_IN_NO_LISTS,
   SOME_URLS,
-} from '../../../src/shared/__url_fixtures.js';
+} from '../../../../src/shared/__url_fixtures.js';
 
 let list;
+const ANOTHER_URL = URL_IN_NO_LISTS;
 
 beforeEach(() => {
   const RANDOM_TYPE = List.types.DENY_LIST;
diff --git a/__tests__/src/lib/request_matcher.spec.js b/__tests__/src/lib/request_matcher.spec.js
index 46bdb82..435fb8c 100644
--- a/__tests__/src/lib/request_matcher.spec.js
+++ b/__tests__/src/lib/request_matcher.spec.js
@@ -1,16 +1,29 @@
 import RequestMatcher from '../../../src/lib/request_matcher.js';
-import { BAD_URL, GOOD_URL } from '../../../src/shared/__url_fixtures.js';
+import {
+  BAD_URL,
+  GOOD_URL,
+  URL_IN_NO_LISTS,
+} from '../../../src/shared/__url_fixtures.js';
 
-beforeAll(() => RequestMatcher.denyList.add(BAD_URL));
-afterAll(() => RequestMatcher.denyList.clear());
+beforeEach(() => {
+  RequestMatcher.allowList.clear();
+  RequestMatcher.denyList.clear();
+});
 
 describe('Request Matcher', () => {
   it('should deny urls in the deny list', () => {
+    RequestMatcher.denyList.add(BAD_URL);
     const result = RequestMatcher.isDenied(BAD_URL);
     expect(result).toBe(true);
   });
 
   it('should not deny urls if they are not in the deny list', () => {
+    const result = RequestMatcher.isDenied(URL_IN_NO_LISTS);
+    expect(result).toBe(false);
+  });
+
+  it('should allow urls if they are in the allow list', () => {
+    RequestMatcher.allowList.add(GOOD_URL);
     const result = RequestMatcher.isDenied(GOOD_URL);
     expect(result).toBe(false);
   });
diff --git a/src/lib/list_populator.js b/src/lib/list_populator.js
index 1943344..264d228 100644
--- a/src/lib/list_populator.js
+++ b/src/lib/list_populator.js
@@ -1,5 +1,5 @@
 import List from './model/list.js';
-import { BAD_URLS } from '../shared/__url_fixtures.js';
+import { BAD_URLS, GOOD_URLS } from '../shared/__url_fixtures.js';
 
 // TODO for now, just populating it with the examples from fixtures
 // TODO real deal: fetch from local files shipped with the extension, augment it with live sources...
@@ -11,10 +11,9 @@ export default class ListPopulator {
   static async populateList(list) {
     const listTypeToUrlMapper = {
       [List.types.DENY_LIST]: BAD_URLS,
+      [List.types.ALLOW_LIST]: GOOD_URLS,
     };
     const urls = listTypeToUrlMapper[list.type];
     list.bulkAdd(urls);
-
-    //TODO https://github.com/lfilho/sample-webextension/issues/8
   }
 }
diff --git a/src/lib/model/allow_list.js b/src/lib/model/allow_list.js
new file mode 100644
index 0000000..25830b6
--- /dev/null
+++ b/src/lib/model/allow_list.js
@@ -0,0 +1,7 @@
+import List from './list.js';
+
+export default class AllowList extends List {
+  constructor() {
+    super(List.types.ALLOW_LIST);
+  }
+}
diff --git a/src/lib/request_matcher.js b/src/lib/request_matcher.js
index eb47375..98317a7 100644
--- a/src/lib/request_matcher.js
+++ b/src/lib/request_matcher.js
@@ -1,9 +1,21 @@
+import AllowList from './model/allow_list.js';
 import DenyList from './model/deny_list.js';
 import ListPopulator from './list_populator.js';
 
-let denyList;
+// Singletons.
+// Meaning since the extension will run on background,
+// we will only load those lists once, saving memory
+let denyList, allowList;
 
 export default class RequestMatcher {
+  static get allowList() {
+    if (!allowList) {
+      allowList = new AllowList();
+      ListPopulator.populateList(allowList);
+    }
+    return allowList;
+  }
+
   static get denyList() {
     if (!denyList) {
       denyList = new DenyList();
@@ -13,6 +25,11 @@ export default class RequestMatcher {
   }
 
   static isDenied(url) {
+    // Allow list implies a user's deliberate action to allow that url
+    // Hence the precedence below
+    if (this.allowList.has(url)) {
+      return false;
+    }
     return this.denyList.has(url);
   }
 }
diff --git a/src/shared/__url_fixtures.js b/src/shared/__url_fixtures.js
index 17be928..6a4966a 100644
--- a/src/shared/__url_fixtures.js
+++ b/src/shared/__url_fixtures.js
@@ -1,8 +1,8 @@
 const A_URL = 'https://example.com';
 const GOOD_URL = 'https://luiz.dev';
 const BAD_URL = 'https://evil-tracker.com';
-const ANOTHER_URL = GOOD_URL;
-const SOME_URLS = [A_URL, ANOTHER_URL, BAD_URL];
+const URL_IN_NO_LISTS = 'https://pudim.com.br';
+const SOME_URLS = [A_URL, URL_IN_NO_LISTS, BAD_URL];
 const TEST_PAGE_GOOD_URL =
   'https://itty.bitty.site/#good_page/data:text/html;charset=utf-8;bxze64,XQAAAALrAQAAAAAAAAAeGInmWR9D5qtrM4PFJv4W1okR98bzFbE2QlIiIqEKRNhWozLGaVxy2UBVi6vb5PjLiS+KmhnoBI2zbVEi38FFqGt0V2dZ/n48NtEOjSTkOFXBuNLAKC6rlcwmvnHnUnMAWA2l/QImsEbNvvf1bv40vbtBzNp9F3TGp/HpcdlmwUSp59tjbjdUlRkOVnMxBaTPI6tnqjg9UBREwBH6Y4c6xLg53hJodPJyK8AysLdOEqC5OPFdGrHq7n6ViwKq90juHDM+UhFD8ug4iSu0Yo74yBMAo7Rtj+Jd5h9AkkjDCs/m4RMIP7KQKT4AldOuVvxaNDd4LcfbH/7lFxzMpv2FPyYxeR5ZmDMwE6422v7jh2OnV4nTcu42kWkhVBP7U06PxG1bBjmd5+5p11z/jK399tAktg==';
 const TEST_PAGE_BAD_URL =
@@ -14,7 +14,7 @@ export {
   A_URL,
   GOOD_URL,
   BAD_URL,
-  ANOTHER_URL,
+  URL_IN_NO_LISTS,
   SOME_URLS,
   TEST_PAGE_BAD_URL,
   TEST_PAGE_GOOD_URL,