If you are not using that profile, the answer is yes. But first look inside and make sure there is nothing you want.

http://kb.mozillazine.org/Profile_folder_-_Firefox#Navigating_to_the_profile_folder

https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles

https://support.mozilla.org/en-US/kb/how-run-firefox-when-profile-missing-inaccessible

Type about:profiles<enter> in the address bar.

This folder stores local storage data that a website can use for offline data storage.

You can remove this folder to cleanup data stored in it. Firefox will recreate this folder when you visit a website that wants to store data. You can probably see what websites currently store data in this folder by the names of these folders.

See also:

• https://developer.mozilla.org/Tools/Storage_Inspector

What the **** is all this cr@p stored in this folder?

I clear history+cache regularly and this cr@p is here, it should not be here wasting disk space, very very lame Mozilla, no wonder people are ditching Firefox in droves when you pull anti-user rubbish like this.

"Tell you when a web site asks to store data for offline use" Not actually doing that are you. /pigged off