Add Firefox import article (#121)

* Add Firefox import article

* Fix typo

_articles/importing/import-data.md

@@ -25,7 +25,7 @@ You can very easily import your data from an array of different password manager
 - Encryptr (csv)
 - Enpass (csv)
 - Enpass (json)
-- Firefox (csv)
+- [Firefox (csv)]({% link _articles/importing/import-from-firefox.md %})
 - F-Secure KEY (fsk)
 - GNOME Passwords and Keys/Seahorse (json)
 - Kaspersky Password Manager (txt)

_articles/importing/import-from-firefox.md

@@ -0,0 +1,32 @@
+---
+layout: article
+title: Import your data from Firefox
+categories: [getting-started]
+featured: true
+popular: false
+tags: [import, firefox]
+---
+
+Since version 57, the Firefox browser no longer provides any password export addons and you will need to use third-party tools. We recommend FF Password Exporter, an open-source tool that works on Windows, macOS, and Linux distributions.
+
+## EXPORT YOUR FIREFOX PASSWORDS
+
+1. [Download][link-ffexporter] and install/run FF Password Exporter. The installation file is under Download/Install section.
+2. Choose the Firefox user's profile directory you want to export passwords from.
+If you have set a master password to protect your Firefox passwords, enter it.
+{% image importing/ff-password-exporter.png %}
+3. Click the export button.
+4. Choose your file format [CSV][csv], and save the file to your device.
+
+## IMPORT YOUR FIREFOX PASSWORDS INTO BITWARDEN
+
+1. Go to the [Bitwarden web vault][bitwarden-vault] and log in.
+2. Navigate to **Tools** → **Import Data**.
+3. Select **Firefox (csv)** as the file format and select your data file from the desktop that you created in the last step from above.
+4. Click the **Import Data** button.
+
+Congratulations! You have just transferred your data from Firefox into Bitwarden.
+
+[bitwarden-vault]: https://vault.bitwarden.com
+[link-ffexporter]:[https://github.com/kspearrin/ff-password-exporter]
+[csv]: https://en.wikipedia.org/wiki/Comma-separated_values