www/firefox60: import firefox60-60.1.0

Mozilla Firefox is a free, open-source and cross-platform web browser
for Windows, Linux, MacOS X and many other operating systems.

It is fast and easy to use, and offers many advantages over other web
browsers, such as tabbed browsing and the ability to block pop-up
windows.

Firefox also offers excellent bookmark and history management, and it
can be extended by developers using industry standards such as XML,
CSS, JavaScript, C++, etc. Many extensions are available.

This package provides Firefox 60 ESR.

Securty fixes:
#CVE-2018-12359: Buffer overflow using computed size of canvas element
#CVE-2018-12360: Use-after-free when using focus()
#CVE-2018-12361: Integer overflow in SwizzleData
#CVE-2018-12362: Integer overflow in SSSE3 scaler
#CVE-2018-5156: Media recorder segmentation fault when track type is changed during capture
#CVE-2018-12363: Use-after-free when appending DOM nodes
#CVE-2018-12364: CSRF attacks through 307 redirects and NPAPI plugins
#CVE-2018-12365: Compromised IPC child process can list local filenames
#CVE-2018-12371: Integer overflow in Skia library during edge builder allocation
#CVE-2018-12366: Invalid data handling during QCMS transformations
#CVE-2018-12367: Timing attack mitigation of PerformanceNavigationTiming
#CVE-2018-12368: No warning when opening executable SettingContent-ms files
#CVE-2018-12369: WebExtension security permission checks bypassed by embedded experiments
#CVE-2018-5187: Memory safety bugs fixed in Firefox 60 and Firefox ESR 60.1
#CVE-2018-5188: Memory safety bugs fixed in Firefox 60, Firefox ESR 60.1, and Firefox ESR 52.9

(ryoon)