This update addresses the following vulnerabilities:

* [CVE-2017-2350](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-2350), [CVE-2017-2354](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-2354), [CVE-2017-2355](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-2355), [CVE-2017-2356](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-2356), [CVE-2017-2362](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-2362), [CVE-2017-2363](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-2363), [CVE-2017-2364](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-2364), [CVE-2017-2365](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-2365), [CVE-2017-2366](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-2366), [CVE-2017-2369](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-2369), [CVE-2017-2371](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-2371), [CVE-2017-2373](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-2373)

Additional fixes:

* Make accelerating compositing mode on-demand again. By default it will only be used for websites that require it, saving a lot of memory on websites that don’t need it.
* Release unused UpdateAtlas and reduce the tile coverage on memory pressure.
* The media backend now stores preloaded media in /var/tmp instead of user cache dir.
* Make inspector work again when accelerated compositing support is disabled.
* Fix a deadlock when the media player is destroyed.
* Fix network process crashes when loading custom URI schemes.
* Fix overlay scrollbars that are over a subframe.
* Fix a crash in GraphicsContext3D::drawArrays when using OpenGL 3.2 core profile.
* Fix BadDamage X errors happening when resizing the WebView.
* Fix several crashes and rendering issues.