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Modifying Firefox to auto save the login information to the Firefox Saved Passwords manager without prompting was easy for version 3 because you can directly edit the JS files from the program’s folder to apply the changes. However, the file structure was a bit different starting from Firefox 4 until the current version 15. We researched and found that it is still possible to force Firefox to auto save the password without the popup notification.

 

For Firefox 3 : all you need to do is edit the nsLoginManagerPrompter.js file with a text editor preferably Notepad++ located in C:\Program Files\Mozilla Firefox\componenets\ folder. Search for the _showSaveLoginNotification function and replace the whole code that is highlighted in yellow…

 

ns_Login_Manager_Prompter.png

 

With the following code:

 

var pwmgr = this._pwmgr;
pwmgr.addLogin(aLogin);

 

The end result would look like the image below.

 

ns_Login_Manager_Prompter_edited.png

 

Save the changes that you’ve made on the nsLoginManagerPrompter.js file and whenever you login to any website, Firefox will auto save the site, username and password to the login manager WITHOUT showing the notification bar. You can access the saved password area by going to Tools > Options > Security and click the Saved Passwords button. There is one possible bug which is even when a user entered the wrong username or password, it will still be saved.

 

 

As for Firefox 4, it gets slightly difficult because the nsLoginManagerPrompter.js file is archived in an omni.jar file located at C:\Program Files\Mozilla Firefox\ folder.

 

Starting from Firefox 5, you may have noticed that editing the nsLoginManagerPrompter.js inside omni.jar file does not work. The Firefox developing team did not fix the bug nor improve the security but instead they optimized it further by making Firefox load a compiled binary version of the nsLoginManagerPrompter.js file instead of the raw and editable JS file. Here is what you need to do to enable auto password saving on Firefox 5 and above. Do take note that the omni.jar file has been renamed to omni.ja starting from Firefox 10.

 

1. Use WinRAR, PowerArchiver or WinZIP to open the omni.jar or omni.ja file from C:\Program Files\Mozilla Firefox\ folder.

2. Navigate to jsloader\resource\gre\components\ and delete the nsLoginManagerPrompter.js file.

 

delete_nsloginmanagerprompter.png

 

3. Go back to the root of omni.jar or omni.jar, and navigate to components folder. Edit the nsLoginManagerPrompter.js file and replace the whole _showSaveLoginNotification function as shown earlier. Save the changes and go back to the archiver. Click the Yes button when the archiver prompts you to update the archive with the updated file.

 

 

Important Notes:

 

 

1. Whenever Firefox gets updated, most likely the omni.ja file will be reverted to the original

2. This article and research is for educational purposes only. Use it with care and think twice before implementing this illegally as it can get you into a lot of trouble!

 

 

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