Please post a crash ID. https://support.mozilla.org/kb/mozilla-crash-reporter-tb#w_viewing-crash-reports

Try to start Thunderbird in safe mode. https://support.mozilla.org/kb/safe-mode-thunderbird

Does the problem go away?

Hi Christ1,

Thank you for your reply. I can't locate the crash report. There is even no Thunderbird folder under Library. I can't seem to install the "viewabout" add-on either. The safe mode is not working either.

The app crashes upon launching.

The only thing I can provide is the details:

AbortMessage: ###!!! ABORT: Could not load UTC timezone, brace yourself and prepare for crash: file /builds/slave/tb-rel-c-esr52-m64_bld-0000000/build/calendar/base/backend/libical/calUtils.h, line 110 AdapterDeviceID: 0x0d22 AdapterVendorID: 0x8086 Add-ons: %7Be2fda1a4-762b-4020-b5ad-a41df1933103%7D:5.4.5.2,%7B972ce4c6-7e08-4474-a285-3208198ce6fd%7D:52.5.2 BuildID: 20171221110448 ContentSandboxCapable: 1 ContentSandboxLevel: 0 CrashTime: 1516104961 EMCheckCompatibility: true Email: EventLoopNestingLevel: 1 FramePoisonBase: 7ffffffff0dea000 FramePoisonSize: 4096 InstallTime: 1515744216 MozCrashReason: MOZ_CRASH() Notes: FP(D00-L1100-W00000000-T0100) AdapterVendorID: 0x8086, AdapterDeviceID: 0x0d22GL Context? GL Context+ xpcom_runtime_abort(###!!! ABORT: Could not load UTC timezone, brace yourself and prepare for crash: file /builds/slave/tb-rel-c-esr52-m64_bld-0000000/build/calendar/base/backend/libical/calUtils.h, line 110) ProductID: {3550f703-e582-4d05-9a08-453d09bdfdc6} ProductName: Thunderbird ReleaseChannel: release SafeMode: 0 SecondsSinceLastCrash: 8379 StartupCrash: 0 StartupTime: 1516104917 TelemetryEnvironment: {"build":{"applicationId":"{3550f703-e582-4d05-9a08-453d09bdfdc6}","applicationName":"Thunderbird","architecture":"x86-64","buildId":"20171221110448","version":"52.5.2","vendor":null,"platformVersion":"52.5.2","xpcomAbi":"x86_64-gcc3","hotfixVersion":null,"architecturesInBinary":"i386-x86_64"},"partner":{"distributionId":null,"distributionVersion":null,"partnerId":null,"distributor":null,"distributorChannel":null,"partnerNames":[]},"system":{"memoryMB":8192,"virtualMaxMB":null,"cpu":{"count":4,"cores":4,"vendor":"GenuineIntel","family":6,"model":70,"stepping":1,"l2cacheKB":256,"l3cacheKB":4096,"speedMHz":2700,"extensions":["hasMMX","hasSSE","hasSSE2","hasSSE3","hasSSSE3","hasSSE4_1","hasSSE4_2","hasAVX","hasAVX2"]},"os":{"name":"Darwin","version":"17.3.0","locale":"en-NL"},"hdd":{"profile":{"model":null,"revision":null},"binary":{"model":null,"revision":null},"system":{"model":null,"revision":null}},"gfx":{"D2DEnabled":null,"DWriteEnabled":null,"ContentBackend":"Skia","adapters":[{"description":null,"vendorID":"0x8086","deviceID":"0x0d22","subsysID":null,"RAM":null,"driver":null,"driverVersion":null,"driverDate":null,"GPUActive":true}],"monitors":[{"screenWidth":1920,"screenHeight":1080,"scale":1}],"features":{"compositor":"basic"}}},"settings":{"blocklistEnabled":true,"e10sEnabled":false,"e10sCohort":"unknown","telemetryEnabled":false,"locale":"en-US","update":{"channel":"release","enabled":true,"autoDownload":true},"userPrefs":{"browser.cache.disk.capacity":358400},"addonCompatibilityCheckEnabled":true,"isDefaultBrowser":null},"profile":{"creationDate":17477},"addons":{"activeAddons":{"{e2fda1a4-762b-4020-b5ad-a41df1933103}":{"blocklisted":false,"description":"Integrated Calendaring & Scheduling for your Email client","name":"Lightning","userDisabled":false,"appDisabled":false,"version":"5.4.5.2","scope":1,"type":"extension","foreignInstall":false,"hasBinaryComponents":false,"installDay":17477,"updateDay":17543,"isSystem":false}},"theme":{"id":"{972ce4c6-7e08-4474-a285-3208198ce6fd}","blocklisted":false,"description":"The default theme.","name":"Default","userDisabled":false,"appDisabled":false,"version":"52.5.2","scope":4,"foreignInstall":false,"hasBinaryComponents":false,"installDay":17443,"updateDay":17521},"activePlugins":[],"activeGMPlugins":{},"activeExperiment":{},"persona":null}} Theme: classic/1.0 Throttleable: 1 UptimeTS: 45.34868842 Vendor: Version: 52.5.2 useragent_locale: en-US

This report also contains technical information about the state of the application when it crashed.

The safe mode is not working either.

What is the problem with safe mode? Just stating that it doesn't work is not helpful.

HI Christ1,

I was using the Option key while trying to launch Thunderbird but nothing happened. The app doesn't launch.

Please try to run Thunderbird via command line using the -safe-mode option. http://kb.mozillazine.org/Safe_mode#Mac_OS_X