I checked it and it seems very useful as a newbie I can find things more easy
I suggest your strongly to add a SSL/TLS encryption so the site is not served as Not Secure
second suggest add target="_blank" so when user search and click on a thread it don't leave ur site
That's strange... Talksearch already has a TLS certificate from Google App Engine. It should not display the "not secure" prompt. Can you try with a different device and browser ans see if you can replicate the issue?
target=_blank sounds like an interesting idea, but it depends on whether people want to leave talksearch after finding the thread they want, or if they are using this as a way to read old posts.