I am using the stock Ubuntu 16.04 desktop, admittedly I do have a wallpaper,
launch bar on the left and status bar on the top.
If I had to guess I'd say it was Firefox, version 52.0.2 (64bit).
Edit: My apologies, I can't stop treating this as windows, it's there on the top left corner!!!
I do notice that the slide bars are very small in Linux, is there a way to widen them? I made the Launch Bar icons smaller but that didn't seem to effect the slide bar.
Edit 2: Yet another question.
I have dual boot and Use an external keyboard and monitor, it used to start ok in Linux (haven't used Win 10 for a long time) but no more.
When I start I have to lift the laptop case to press the start button then I usually close it and all starts fine. Now part way through loading, the computer decides to hibernate, or I assume so, all stops until I lift the lid again then it carries on to desktop screen.
In the Power settings I have "When the lid is closed"
Do Nothing for both power settings, also discovered that when I open and close the lid anytime it hibernates. Weird!!