Drowser is described as 'Avoid rogue apps from running in the background with Drowser' and is a Battery Saver in the System & Hardware category. There are eight alternatives to Drowser for Android and Android Tablet. The best alternative is SD Maid, which is free. Other great apps like Drowser are Greenify (Free), SuperFreezZ (Free, Open Source), Battery Doctor (Free) and DU Battery Saver (Freemium).
This is a powerful tool! Use at own risk! Nobody is perfect and Android neither. Apps you have already deleted, sometimes leave data behind. The system constantly creates logs, crash reports and debug files you don't really need.
Never should your phone or tablet become slower and battery hungrier after lots of apps installed. With Greenify, your device can run almost as smoothly and lastingly as it did the first day you had it!
Description *** Requires Root and the Xposed Framework *** Unsolicited quotes from real users: "It gave me about 2 hours more use with 30 minutes more screen on time. Saved me from buying a $25 battery."