I've been trying to sync Firefox Developer Edition using my Sync account, but whenever I try I get the message: "No connection. You must be connected to the Internet to sign in." Clicking the "Try again" button produces the message shown in the attached image regarding an "invalid security certificate". Troubleshooting info is below in case that's of help. Any ideas? Many thanks, Andrew ======================================= Application Basics ------------------ Name: Firefox Version: 46.0a2 Build ID: 20160219004008 Update Channel: aurora User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0 Multiprocess Windows: 1/1 (Enabled by default) Safe Mode: false Crash Reports for the Last 3 Days --------------------------------- All Crash Reports Extensions ---------- Name: Adobe Acrobat DC - Create PDF Version: 15 Enabled: true ID: web2pdfextension.15@web2pdf.adobedotcom Name: Firefox Hello Beta Version: 1.1.2 Enabled: true ID: loop@mozilla.org Name: Pocket Version: 46.0a2 Enabled: true ID: firefox@getpocket.com Name: E-Web Print Version: 1.23.00 Enabled: false ID: e-webprint@epson.com Graphics -------- Adapter Description: NVIDIA GeForce GTX 660 Adapter Drivers: nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um Adapter RAM: 2048 Asynchronous Pan/Zoom: wheel input enabled Device ID: 0x11c0 Direct2D Enabled: true DirectWrite Enabled: true (6.2.9200.17568) Driver Date: 10-23-2013 Driver Version: 9.18.13.3165 GPU #2 Active: false GPU Accelerated Windows: 1/1 Direct3D 11 (OMTC) Subsys ID: 11c01569 Supports Hardware H264 Decoding: Yes Vendor ID: 0x10de WebGL Renderer: Google Inc. -- ANGLE (NVIDIA GeForce GTX 660 Direct3D11 vs_5_0 ps_5_0) windowLayerManagerRemote: true AzureCanvasBackend: direct2d 1.1 AzureContentBackend: direct2d 1.1 AzureFallbackCanvasBackend: cairo AzureSkiaAccelerated: 0 Important Modified Preferences ------------------------------ browser.cache.disk.capacity: 358400 browser.cache.disk.filesystem_reported: 1 browser.cache.disk.smart_size.first_run: false browser.cache.disk.smart_size.use_old_max: false browser.cache.frecency_experiment: 3 browser.download.importedFromSqlite: true browser.places.smartBookmarksVersion: 7 browser.sessionstore.upgradeBackup.latestBuildID: 20160219004008 browser.startup.homepage_override.buildID: 20160219004008 browser.startup.homepage_override.mstone: 46.0a2 dom.apps.reset-permissions: true dom.mozApps.used: true extensions.lastAppVersion: 46.0a2 gfx.crash-guard.d3d11layers.appVersion: 46.0a2 gfx.crash-guard.d3d11layers.deviceID: 0x11c0 gfx.crash-guard.d3d11layers.driverVersion: 9.18.13.3165 gfx.crash-guard.d3d11layers.feature-d2d: true gfx.crash-guard.d3d11layers.feature-d3d11: true gfx.crash-guard.glcontext.gfx.driver-init.direct3d11-angle: true gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle: true gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle-force-d3d11: false gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle-force-warp: false gfx.crash-guard.glcontext.gfx.driver-init.webgl-angle-try-d3d11: true gfx.crash-guard.status.d3d11layers: 2 gfx.crash-guard.status.d3d9video: 2 gfx.crash-guard.status.glcontext: 2 gfx.direct3d.last_used_feature_level_idx: 0 media.gmp-eme-adobe.abi: x86-msvc-x64 media.gmp-eme-adobe.lastUpdate: 1453735160 media.gmp-eme-adobe.version: 15 media.gmp-gmpopenh264.abi: x86-msvc-x64 media.gmp-gmpopenh264.lastUpdate: 1453735161 media.gmp-gmpopenh264.version: 1.5.3 media.gmp-manager.buildID: 20160215004021 media.gmp-manager.lastCheck: 1455923068 media.hardware-video-decoding.failed: false network.cookie.prefsMigrated: true network.predictor.cleaned-up: true places.database.lastMaintenance: 1453737570 places.history.expiration.transient_current_max_pages: 104858 plugin.disable_full_page_plugin_for_types: application/pdf plugin.importedState: true privacy.sanitize.migrateClearSavedPwdsOnExit: true services.sync.declinedEngines: storage.vacuum.last.index: 0 storage.vacuum.last.places.sqlite: 1453737570 Important Locked Preferences ---------------------------- JavaScript ---------- Incremental GC: true Accessibility ------------- Activated: false Prevent Accessibility: 0 Library Versions ---------------- NSPR Expected minimum version: 4.12 Version in use: 4.12 NSS Expected minimum version: 3.22.1 Basic ECC Version in use: 3.22.1 Basic ECC NSSSMIME Expected minimum version: 3.22.1 Basic ECC Version in use: 3.22.1 Basic ECC NSSSSL Expected minimum version: 3.22.1 Basic ECC Version in use: 3.22.1 Basic ECC NSSUTIL Expected minimum version: 3.22.1 Version in use: 3.22.1 Experimental Features ---------------------