Delay around the addon install

test/e2e/firefox/metamask.spec.js

@@ -16,6 +16,7 @@ describe('', function () {
   before(async function () {
     const extPath = path.resolve('dist/firefox')
     driver = buildFirefoxWebdriver()
+    await delay(2000)
     installWebExt(driver, extPath)
     await delay(2000)    
   })
@@ -34,7 +35,7 @@ describe('', function () {
 
     it('switches to Firefox addon list', async function () {
       await driver.get('about:debugging#addons')
-      await delay(1000)
+      await delay(10000)
     })
 
     it(`selects MetaMask's extension id and opens it in the current tab`, async function () {