Browsedb is, as said in the description, "BrowseDB is a javascript clientside library for managing localStorage data in mongoose style.". Anything that will make it better than it is now is welcome.
When contributing please be sure to add JSDOC style comments right before your code. The comment must include your name and email address, possibly github profile link.
We have an active and full issue tracker that I'd love you to help with. You could go find something broken and fix it.