fix(ui) Fix stream dropdown positioning in firefox (#12701)
fix(ui) Fix stream dropdown positioning in firefox (#12701)

The sort dropdown is mispositioned in Firefox, and entirely missing in
beta/alpha firefox. These changes address those problems without
disrupting display in chrome or safari.
mvaled/sentry,mvaled/sentry,mvaled/sentry,mvaled/sentry,beeftornado/sentry,beeftornado/sentry,mvaled/sentry,mvaled/sentry,beeftornado/sentry