Written by PChan on 2017-03-11

Every once in a while, you might get the following error:

The easiest way to resolve the issue of a non-functional browser is to switch to a different one such as chromium.

For an actual solution:

1. Fire up a terminal

2. Execute the following command:

\$ find ~/.mozilla/firefox -iname "*lock" -delete

3. Close the terminal and try opening Firefox again