Since fire shield makes you glow and invisibility only extend to things you're wearing or carrying. People can more or less see you. Does it then cancel out invisibility?
Fire shield:
Thin and wispy flames wreathe your body for the Duration, shedding bright light in a 10-foot radius
Invisibility:
Anything the target is wearing or carrying is invisible as long as it is on the target's person.
You emit bright light in a 10 foot radius, but this light does not cancel the Invisible condition. In terms of the game mechanics, you still can't be targeted by spells requiring the caster to see the target, and all attacks against you still get disadvantage.
Jeremy Crawford, a D&D 5e game designer, says that invisibility doesn't make you disappear:
The invisibility spell doesn't automatically hide you; you still make noise.
So even when you become invisible, enemies can still reveal your location and attack you, with disadvantage. Usually DM asks for a Perception/Stealth opposed check in order to resolve the outcome (are you hidden or not).
However, if you're emitting light, it's reasonable to assume you can't hide your presence at all. Your enemies will know where are you located (in what square, if your DM uses a grid) and can attack this place (this square). But you still get all the rest benefits of being invisible.
