chore(firefox): move sources from //lib/firefox to //lib (#3920)

experimental/puppeteer-firefox/index.js

@@ -13,8 +13,8 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-const FirefoxLauncher = require('./lib/firefox/Launcher.js').Launcher;
-const BrowserFetcher = require('./lib/firefox/BrowserFetcher.js');
+const FirefoxLauncher = require('./lib/Launcher.js').Launcher;
+const BrowserFetcher = require('./lib/BrowserFetcher.js');
 
 class Puppeteer {
   constructor() {

experimental/puppeteer-firefox/lib/Launcher.js

@@ -23,7 +23,7 @@ const readline = require('readline');
 const fs = require('fs');
 const util = require('util');
 const {helper} = require('./helper');
-const {TimeoutError} = require('../Errors')
+const {TimeoutError} = require('./Errors')
 const FirefoxTransport = require('./FirefoxTransport');
 
 const mkdtempAsync = util.promisify(fs.mkdtemp);

experimental/puppeteer-firefox/lib/Page.js

@@ -1,8 +1,8 @@
 const {helper, assert, debugError} = require('./helper');
 const {Keyboard, Mouse} = require('./Input');
-const {constants} = require('../common');
+const {constants} = require('./common');
 const {Dialog} = require('./Dialog');
-const {TimeoutError} = require('../Errors');
+const {TimeoutError} = require('./Errors');
 const fs = require('fs');
 const mime = require('mime');
 const util = require('util');

experimental/puppeteer-firefox/lib/helper.js

@@ -13,7 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-const {TimeoutError} = require('../Errors');
+const {TimeoutError} = require('./Errors');
 
 /**
  * @internal

experimental/puppeteer-firefox/misc/install-preferences.js

@@ -7,7 +7,7 @@ const path = require('path');
 // Based on:   https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/Enterprise_deployment_before_60#Configuration
 async function installFirefoxPreferences(executablePath) {
   const firefoxFolder = path.dirname(executablePath);
-  const {helper} = require('../lib/firefox/helper');
+  const {helper} = require('../lib/helper');
   const mkdirAsync = helper.promisify(fs.mkdir.bind(fs));
 
   let prefPath = '';