Topic switcher issue
I noticed that when you click a topic/tag like for example 'bug report' then switch back to 'All' it doesn't change the url parameter. Hence when you then refresh the page it goes back to the 'bug report' even though visually and functionally you where on the 'all'.
Not the biggest bug ever, but a bit annoying sometimes.
Thanks for reporting. I've fixed the issue locally and created a pull request for it.