From this website we have mentioned the KeePass app many times. It is a password manager that can work seamlessly with Firefox, or Chrome (Chromium for Linux).
I have been using the KeePass application for several years, and I insist on why I consider it one of the safest ones. Your sensitive data is not stored in the cloud, but locally on your system encrypted.
Below we will see how you can successfully install KeePass2 on a system that runs Ubuntu and connect it to Firefox or Chromium.
Open the Ubuntu software center and search for KeePass
Make the installation. If you prefer installing from the software center later, you will need to install Mono manually. Alternatively and more easily open a terminal and type the following command:
sudo apt-get install keepass2 mono-complete
The additional mono-complete is necessary for KeePass's collaboration with your browser. The process of installing the Mono libraries will take a few minutes.
When finished, download it KeepassHttp from Github.
Open .zip on your desktop.
We will only need the archive KeePassHttp.plgx.
Right-click inside the KeePassHttp folder to open a terminal and make a directory plugins in the KP installation folder.
With the second command, you will move the .plgx to the new folder you created:
sudo mkdir / usr / lib / keepass2 / plugins sudo mv KeePassHttp.plgx / usr / lib / keepass2 / plugins /
If you now open the XExplorer and see the "KeePassHttp Options" in the Tools menu. then the plugin works.
Now let's get the codes you've saved in Firefox now and let's get them into a database that we create at KeePass.
Open your Firefox and install the Password Exporter extension. No need to restart the browser. Enable the extension and follow the path from your browser menu: Edit - Preferences - Security 
Click on Import Export Passwords and the window you see above will open picture. Click on Export Passwords without checking Obfuscte Usernames Passwords.
Save .xml and open KeePass
From the menu File – New create a new database and make your staff key encryption by moving your mouse pointer in the left box and typing whatever characters you want in the right box (the characters should not be remembered later)
After creating the database, we can enter the Firefox code from .xml
From the KeePass menu on the new base you created, select File and Import
Select the Password Exporter XML file and the .xml file containing the Firefox passwords.
If you followed all of the above steps correctly, now you have installed KeePass, Mono and KeePassHttp, you have created an encrypted database and have passed all the passwords you got from the Firefox you are using.
Let's now see how we can connect Firefox with KeePass, KeePass with Chromium,
Install it ChromelPass for Chrome or Chrome PasslFox for Firefox. Restart your browser.
After restart ChromelPass or PasslFox will ask you to connect to KeePassHttp. Type a big one code. This will generate an encryption key that will be stored in the KeePass2 database.
That's it, try now to connect to a website.
ChromeIPass autofills passwords without any problems, while PasslFox works for some and for others it only works by right-clicking - autofill.
