Security update for MozillaThunderbird

This update for MozillaThunderbird fixes the following issues: Mozilla Thunderbird was updated to 60.7.0. * Attachment pane of Write window no longer focussed when attaching files using a keyboard shortcut These security issues were fixed (MFSA 2019-15 bsc#1135824): * CVE-2019-9815: Disable hyperthreading on content JavaScript threads on macOS * CVE-2019-9816: Type confusion with object groups and UnboxedObjects * CVE-2019-9817: Stealing of cross-domain images using canvas * CVE-2019-9818: Use-after-free in crash generation server * CVE-2019-9819: Compartment mismatch with fetch API * CVE-2019-9820: Use-after-free of ChromeEventHandler by DocShell * CVE-2019-11691: Use-after-free in XMLHttpRequest * CVE-2019-11692: Use-after-free removing listeners in the event listener manager * CVE-2019-11693: Buffer overflow in WebGL bufferdata on Linux * CVE-2019-7317: Use-after-free in png_image_free of libpng library * CVE-2019-9797: Cross-origin theft of images with createImageBitmap * CVE-2018-18511: Cross-origin theft of images with ImageBitmapRenderingContext * CVE-2019-11694: (Windows only) Uninitialized memory memory leakage in Windows sandbox * CVE-2019-11698: Theft of user history data through drag and drop of hyperlinks to and from bookmarks * CVE-2019-5798: Out-of-bounds read in Skia * CVE-2019-9800: Memory safety bugs fixed in Firefox 67 and Firefox ESR 60.7