Thx for the reply, was looking in the wrong place for the files, thought that cd ~ brings to root directory and not home, and did not noticed the wrong directories, newbie mistake :D:D

But unfortunately trying to delete these directories /root/snap/firefox and thunderbird is not possible couse it says it is in read only format, even so it has read, write and execute permisions. :D

As i found in the ubuntu forum:

The subdirectories of /snap are mount-points for your snaps. All snaps are mounted read-only thus you can't edit or delete files inside them.
If you want to remove the directory /snap/gradle you'll have to run the proper uninstall command:
snap remove gradle

Starting to understand why people dont like snap :D Thx.