SteamDetective is a userscript that aims to make background checks on Steam easier and faster. Its primary objective is to make scammers and alts significantly easier to spot.
Current features
View Steam account information:
ID2, ID3, ID64, URL
Account creation date
Trade/community bans
Trade banned
Trade probation
Community banned
Limited account status (<5$ USD spent)
View reputation from:
SteamRep
Status
Forum search
Name history
Banned friends (if applicable)
Pending reports (if applicable)
Backpack.tf
Status (Banned, Feature banned, Normal, No account)
Last visited
Premium status
Amount donated
Inventory value/rank/slots/pure
Trust
Profile/backpack/forums/trust/issues links
Mannco.store
Status (Normal, Banned, No account)
Show profile link if account found
Marketplace.tf
Status (Normal, Banned)
Scrap.tf
Status (Normal, Banned, No account)
Show profile link if account found
Skial
Status (Normal, No account, Banned, Unbanned)
Visited servers (type, last username, first and last seen, playtime)