Asking how to filter tags or exlude tags is often asked in the forum threads. There is a feature for this, but it is hidden and unwieldy, since you have to manually append a search string to the browse url. You could use bookmarks, but that does not help, when adding tags, as it will clear the search string with the new page.
So, I created a little thing that adds a box to manage the tag exclude feature. On the plus side, this will persist after browser restart and of course while browsing and adding and removing tags.
On the downside, it is an unpacked chrome extension. So you need chrome and activate developer mode. Firefox does not support manifest 3 service workers and you would have to load it again after each restart anyways. (Update: I added a Firefox version anyways. Loading the extension after each browser start still beats adding the extension query every time you change browse urls.)