SteamDB

– Adds links to SteamDB across Steam sites
– Adds a link to PCGamingWiki
– Display lowest recorded price on game pages (all currencies supported, price history)
– Display concurrent players and peaks on game pages
– Display latest game update on game page
– Quick sell buttons in inventory
– Skip age check gate on the store
– Accept market agreement automatically
– Remove linkfilter links
– Highlight your owned games, DLCs and packages on steamdb.info
– Allows wishlisting, following and ignoring games directly from steamdb.info
– A lot of other smaller tweaks and features
– Simpler and faster alternative to Enhanced Steam and Augmented Steam

More information: https://steamdb.info/extension/
GitHub: https://github.com/SteamDatabase/BrowserExtension