I use the first 3, they compound too (in a slightly strange way, https://support.mozilla.org/en-US/kb/awesome-bar-search-fire..., see last few paras.).
It's important that you type them AFTER the thing to search for, not before.
For example, `mytag +` instead of `+ mytag`.
I found that quite surprising.
It's important that you type them AFTER the thing to search for, not before.
For example, `mytag +` instead of `+ mytag`.
I found that quite surprising.