After using the keyboard to add a file to the Exporter, keyboard focus becomes trapped somewhere - there is no focus styling on any element on the page, tabbing does not change focus to any element on the page, and pressing Enter doesn't do anything.
1. Load Decapod Exporter
2. Using keyboard, tab to the "Browse files" button.
3. Press enter to bring up the file browser.
4. Select a file.
5. Notice that the focus is now trapped.
The problem doesn't appear if the user opens the file browser and then closes it without selecting a file.