Keeps unreasonable memory cache

[themusicgod1]

After a few hours of browsing the web, leaving a single tab open:
RES 3.3 gb
VIRT 10.2 gb
this is...quite a lot of memory for a web browser.

Ubuntu: 15.04
Arora: 0.11.0+qt5+git2014-04-06-1

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: arora 0.11.0+qt5+git2014-04-06-1 [modified: usr/share/applications/arora.desktop]
ProcVersionSignature: Ubuntu 3.18.0-12.13-generic 3.18.4
Uname: Linux 3.18.0-12-generic x86_64
ApportVersion: 2.15.1-0ubuntu4
Architecture: amd64
CurrentDesktop: GNOME
Date: Mon Feb 9 12:20:17 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-07-09 (214 days ago)
InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Alpha amd64 (20140708)
SourcePackage: arora
UpgradeStatus: No upgrade log present (probably fresh install)

[themusicgod1 (themusicgod1)]

Arora will actually keep using memory until the entire system runs out: there is a memory leak