Search by using the search bar in the top right corner, above the text "Return to Project-GC". I think that search also searches in the tags, I tested it with some random tags that only had one question tagged and that question popped up in the top 3 for my small sample at least. A search for "virtual-gps" showed that all of the first page of results had the tag "virtual-gps".
So if you want for example all questions about "web-browser-extension", it might just be easiest to search web-browser-extension in the search. You should then get both questions tagged with "web-browser-extension" and with "web", "browser", "extension" so it's more likely you find what you're looking for any way. :) And if you just want the ones with a specific tag you could just click the tag in the search result, instead of trying to find it on the tags-page.
