Ability to include browser extensions for browser in loopi

**Is your feature request related to a problem? Please describe.**
Not related to any problem but I would like the ability to install browser extensions such as ublock Origin etc. 

**Describe the solution you'd like**
Ability to include the .chromium.zip file or .firefox.signed.xpi for the browser to use.  

**Describe alternatives you've considered**
n/a

**Additional context**
n/a