• focus the Language Selector (using TAB about three times in the page)
• press TAB to go to the next anchor, in the language selection dropdown

The browser probably tries to go to the next anchor but since it is only shown when the LS button is focused, the keyboard focus is in the void and the loop resets. (firefox 61)

We should probably open an issue or ask for help about this. All the tricks I've tried so far have proven unsuccessful.