Usability Improvements for Browser

It would be great if the Browser would have certain features:
1. ~~Image Preview in Browser: I think it is rather important for a Browser to have a preview for the textures. This could be either on hover or the file-icon could be replaced by the preview (or at least having the feature to switch to this possibility)~~
- [x] ~~Allow access to network drives on Windows. For me this is not so important but for teams working together having a shared library of textures it might be important.~~ E.g: \\\\network-drive\texture-catalog\
- [x] ~~Adding a few items results in unaccessible ones. There could be a scroll bar or something like that.~~ 

The issue does not name any files, tests, or entry points. Review the three checklist items and the linked screenshot first; all listed requests are marked complete, so the issue provides no clear remaining change or definition of done.

Written by the indexing model from the issue text.