diff --git a/src/config.js b/src/config.js
index 7ac9ebd2ed..fc18bfaf75 100644
--- a/src/config.js
+++ b/src/config.js
@@ -155,6 +155,8 @@ export async function discoverConfigFiles({ getHomeDir = os.homedir } = {}) {
     path.join(process.cwd(), 'package.json'),
     // Look for a magic config in the current working directory.
     path.join(process.cwd(), magicConfigName),
+    // Look for a magic hidden config (preceded by dot) the current working directory.
+    path.join(process.cwd(), `.${magicConfigName}`),
   ];
 
   const configs = await Promise.all(
diff --git a/tests/unit/test.config.js b/tests/unit/test.config.js
index 5c0db86083..aa01fb8069 100644
--- a/tests/unit/test.config.js
+++ b/tests/unit/test.config.js
@@ -1018,7 +1018,7 @@ describe('config', () => {
         process.chdir(tmpDir.path());
         try {
           const expectedConfig = path.resolve(
-            path.join(process.cwd(), 'web-ext-config.js'),
+            path.join(process.cwd(), '.web-ext-config.js'),
           );
           await fs.writeFile(expectedConfig, 'module.exports = {}');
 
@@ -1054,15 +1054,25 @@ describe('config', () => {
           );
 
           const projectConfig = path.resolve(
-            path.join(process.cwd(), 'web-ext-config.js'),
+            path.join(process.cwd(), '.web-ext-config.js'),
           );
           await fs.writeFile(projectConfig, 'module.exports = {}');
 
+          const projectConfigUndotted = path.resolve(
+            path.join(process.cwd(), 'web-ext-config.js'),
+          );
+          await fs.writeFile(projectConfigUndotted, 'module.exports = {}');
+
           assert.deepEqual(
             await _discoverConfigFiles({
               getHomeDir: () => fakeHomeDir,
             }),
-            [globalConfig, packageJSONConfig, projectConfig],
+            [
+              globalConfig,
+              packageJSONConfig,
+              projectConfigUndotted,
+              projectConfig,
+            ],
           );
         } finally {
           process.chdir(lastDir);