i performed a fresh install of LMDE3 cindy on the laptop so firefox install is vanilla 68.6.0esr ( no addons until it has synched). running firefox from Terminal on 2 occasions gives grahamj@aspire:~$ firefox IPDL protocol error: Error deserializing 'focusTarget' (FocusTarget) member of 'TransactionInfo' ExceptionHandler::GenerateDump cloned child 2186 ExceptionHandler::SendContinueSignalToChild sent continue signal to child ExceptionHandler::WaitForContinueSignal waiting for continue signal... grahamj@aspire:~$ Exiting due to channel error. grahamj@aspire:~$ firefox IPDL protocol error: Error deserializing 'focusTarget' (FocusTarget) member of 'TransactionInfo' ExceptionHandler::GenerateDump cloned child 4830 ExceptionHandler::SendContinueSignalToChild sent continue signal to child ExceptionHandler::WaitForContinueSignal waiting for continue signal... Sandbox: Unexpected EOF, op 0 flags 00 path /usr/share/fonts/truetype/dejavu/DejaVuSansMono.ttf (/opt/firefox/firefox-bin:4818): Pango-WARNING **: failed to create cairo scaled font, expect ugly output. the offending font is 'DejaVu Sans Mono 5.25' (/opt/firefox/firefox-bin:4818): Pango-WARNING **: font_face status is: <unknown error status> (/opt/firefox/firefox-bin:4818): Pango-WARNING **: scaled_font status is: out of memory Exiting due to channel error. grahamj@aspire:~$ here is a dump from the first instance AdapterDeviceID: 0x9804 AdapterDriverVendor: mesa/r600 AdapterDriverVersion: 13.0.6.0 AdapterVendorID: 0x1002 BuildID: 20200305175243 ContentSandboxCapabilities: 87 ContentSandboxCapable: 1 ContentSandboxLevel: 4 CrashTime: 1584095434 DOMIPCEnabled: 1 FramePoisonBase: 9223372036600930304 FramePoisonSize: 4096 IPCFatalErrorMsg: Error deserializing 'focusTarget' (FocusTarget) member of 'TransactionInfo' InstallTime: 1584095053 IsWayland: 0 MozCrashReason: MOZ_CRASH(IPC FatalError in the parent process!) Notes: LMDE 3 CindyFP(D00-L1000-W00000000-T000) WR? WR- OMTP? OMTP+1 ProductID: {ec8030f7-c20a-464f-9b0e-13a3a9e97384} ProductName: Firefox ReleaseChannel: default SafeMode: 0 SecondsSinceLastCrash: 348 StartupCrash: 0 StartupTime: 1584095430 TelemetryEnvironment: {"build":{"applicationId":"{ec8030f7-c20a-464f-9b0e-13a3a9e97384}","applicationName":"Firefox","architecture":"x86-64","buildId":"20200305175243","version":"68.6.0","vendor":"Mozilla","displayVersion":"68.6.0esr","platformVersion":"68.6.0","xpcomAbi":"x86_64-gcc3","updaterAvailable":true},"partner":{"distributionId":null,"distributionVersion":null,"partnerId":null,"distributor":null,"distributorChannel":null,"partnerNames":[]},"system":{"memoryMB":3683,"virtualMaxMB":null,"cpu":{"count":2,"cores":2,"vendor":"AuthenticAMD","family":20,"model":1,"stepping":null,"l2cacheKB":512,"l3cacheKB":512,"speedMHz":1000,"extensions":["hasMMX","hasSSE","hasSSE2","hasSSE3","hasSSSE3"]},"os":{"name":"Linux","version":"4.9.0-12-amd64","locale":"en-NZ"},"hdd":{"profile":{"model":null,"revision":null,"type":null},"binary":{"model":null,"revision":null,"type":null},"system":{"model":null,"revision":null,"type":null}},"gfx":{"D2DEnabled":null,"DWriteEnabled":null,"ContentBackend":"Skia","Headless":false,"adapters":[{"description":"\u0000\u0001\u0002\u0003\u0004\u0005\u0006\u0007\b\t\n\u000b\f\r\u000e\u000f\u0010\u0011\u0012\u0013\u0014\u0015\u0016\u0017\u0018\u0019\u001a\u001b\u001c\u001d\u001e\u001f !\"#$%&'()*+,-./0123456789:;<=>?@","vendorID":"0x1002","deviceID":"0x9804","subsysID":null,"RAM":null,"driver":null,"driverVendor":"mesa/r600","driverVersion":"13.0.6.0","driverDate":null,"GPUActive":true}],"monitors":[{"screenWidth":1024,"screenHeight":600}],"features":{"compositor":"none","gpuProcess":{"status":"unused"},"wrQualified":{"status":"blacklisted"},"webrender":{"status":"opt-in"}}},"appleModelId":null},"settings":{"blocklistEnabled":true,"e10sEnabled":true,"e10sMultiProcesses":8,"telemetryEnabled":false,"locale":"en-US","intl":{},"update":{"channel":"default","enabled":true},"userPrefs":{"browser.search.widget.inNavBar":false},"sandbox":{"effectiveContentProcessLevel":4},"addonCompatibilityCheckEnabled":true,"isDefaultBrowser":null},"profile":{}} ThreadIdNameMapping: 1635:"Gecko_IOThread",1637:"JS Helper",1636:"JS Watchdog",1638:"JS Helper",1639:"Timer",1640:"Link Monitor",1641:"Socket Thread",1650:"Cache2 I/O",1651:"Cookie",1652:"StreamTrans #1",1653:"GMPThread",1654:"Worker Launcher",1655:"SoftwareVsyncThread",1656:"Compositor",1657:"ImgDecoder #1",1658:"ImageIO",1663:"ImageBridgeChild",1664:"IPDL Background",1665:"DOM Worker",1666:"StreamTrans #2",1667:"Breakpad Server",1671:"FS Broker 1670",1672:"ProcessHangMon",1678:"DataStorage",1680:"DNS Resolver #1", Throttleable: 1 UptimeTS: 4.3305486 Vendor: Mozilla Version: 68.6.0 useragent_locale: en-US This report also contains technical information about the state of the application when it crashed. running firefox in 'safe mode from terminal gave the same error messages, submitted Crash ID: bp-a399fa88-e9bb-478e-87e8-8d6750200313