How to import .cer certificate files in Google Chrome on Linux

I have now started my journey as a second year student at Amrita Vishwa Vidyapeetham, Amritapuri. At this point of time, I've registered for the Wi-Fi provided here. At first they tell us to import a .cer file in the browser we use.

But Google Chrome on Linux does not have a functionality to import .cer files...Instead we can only import .crt files in Chrome Browser. So I'll guide you in importing a .cer file in Chrome.

PREREQUISITES

A .cer file
Mozilla Firefox v40+ on Linux (or any browser based on it)
Google Chrome v47+ on Linux (or any other browser based on it)

GETTING STARTED

First of all download the .cer file. In my case I downloaded the Fortinet certificate file from my campus. Then we have to import this .cer file in Firefox first. To do this:

Open Firefox from your shell Launcher or type firefox in terminal
Then click on the Hamburger menu on the top right corner of Firefox. Select the Preferences Option
Go to Advanced section
Select the Certificates sub-menu. Click on the "View Certificates" Button.
Certificate Manager window will pop up.
Go to Authorities sub-menu. Select Import; then navigate to the folder containing your .cer File and then import it.
After it gets imported, click on that Certificate file you imported and then click export. You must now see something with .crt extension in the Save As dialog box.
Give a name you like to the certificate (PS. Dont forget the .crt extension)
Then Open Google Chrome and click on the 3 dots in the upper right corner and go to Settings
Click On Show Advanced Settings
Scroll down to the HTTPS/SSL section and click on the Manage Certificates button.
Go to the Authorities tab. Select Import and then choose your .crt file
Depending on your needs, select the options from below. I had to choose only the first one, as per the instructions from my College Wi-Fi Registration Instructions.