Fire Bug, apart of burning sugar cane, is used in following Quests:
Meriana Quest- Used on catapult
Machinery of War Quest- Used on the Ballistaes and Catapults
Dreamer's Challenge Quest- On a field to get teleport
Blood Brothers Quest- used on Twines to get teleported to Boreth's Room
Treasure Hunt Quest- Used on Very Old Piece of Paper to become Old Encrypted Text
Tower Defence Quest- Used on the Goblins Bed
Secret Service Quest (TBI)- Used on the tile next to the wood to set the shipyard on fire
Kissing a Pig Quest - using on Coal Basin to lighten up
* sourced from updated TibiaWiki 1
I also found following quest where you need it:
Ferumbras Ascension Quest- Pumin Seal - lighting up the Basins
On Spider Webs (can be replaced with the melee weapon) - in An Interest in Botany Quest, Crusader Helmet Quest, A Father Burden Quest, Against the spider Cult Quest
1. https://tibia.fandom.com/wiki/Fire_Bug
2. https://tibia.fandom.com/wiki/Ferumbras%27_Ascension_Quest#Pumin_-_Tarbaz.27s_Seal
3. https://tibia.fandom.com/wiki/Spider_Web
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