hello jenepherre, that's strange indeed. could you go to the firefox menu ≡ > help ? > troubleshooting information, copy the contents of that page and paste them here into a reply on the forum? this might give us a clue what is going on...

Meant to include that the first time. Sorry.

Application Basics

Name: Firefox Version: 34.0.5 User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0 Multiprocess Windows: 0/1

Crash Reports for the Last 3 Days

All Crash Reports

Extensions

Name: DigitalPersona Extension Version: 5.0.0.4941 Enabled: false ID: otis@digitalpersona.com

Name: PassShow Version: 1.150 Enabled: false ID: {57c20073-e24b-4b2a-aa91-70d1ad526cbf}

Name: Skype Click to Call Version: 7.3.16540.9015 Enabled: false ID: {82AF8DCA-6DE9-405D-BD5E-43525BDAD38A}

Graphics

Adapter Description: NVIDIA GeForce GT 425M Adapter Drivers: nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um Adapter RAM: 1023 Device ID: 0x0df0 Direct2D Enabled: true DirectWrite Enabled: true (6.2.9200.16571) Driver Date: 10-16-2012 Driver Version: 9.18.13.721 GPU #2 Active: false GPU Accelerated Windows: 1/1 Direct3D 11 (OMTC) Subsys ID: 00000000 Vendor ID: 0x10de WebGL Renderer: Google Inc. -- ANGLE (NVIDIA GeForce GT 425M Direct3D9Ex vs_3_0 ps_3_0) windowLayerManagerRemote: true AzureCanvasBackend: direct2d AzureContentBackend: direct2d AzureFallbackCanvasBackend: cairo AzureSkiaAccelerated: 0

Important Modified Preferences

browser.cache.disk.capacity: 358400 browser.cache.disk.smart_size.first_run: false browser.cache.frecency_experiment: 4 browser.places.smartBookmarksVersion: 7 browser.sessionstore.upgradeBackup.latestBuildID: 20141126041045 browser.startup.homepage_override.buildID: 20141126041045 browser.startup.homepage_override.mstone: 34.0.5 browser.tabs.warnOnClose: false extensions.lastAppVersion: 34.0.5 gfx.direct3d.last_used_feature_level_idx: 0 media.gmp-manager.lastCheck: 1418004652 network.cookie.prefsMigrated: true places.history.expiration.transient_current_max_pages: 104858 plugin.disable_full_page_plugin_for_types: application/pdf plugin.importedState: true privacy.sanitize.migrateFx3Prefs: true

Important Locked Preferences

JavaScript

Incremental GC: true

Accessibility

Activated: true Prevent Accessibility: 0

Library Versions

NSPR Expected minimum version: 4.10.7 Version in use: 4.10.7

NSS Expected minimum version: 3.17.2 Basic ECC Version in use: 3.17.2 Basic ECC

NSSSMIME Expected minimum version: 3.17.2 Basic ECC Version in use: 3.17.2 Basic ECC

NSSSSL Expected minimum version: 3.17.2 Basic ECC Version in use: 3.17.2 Basic ECC

NSSUTIL Expected minimum version: 3.17.2 Version in use: 3.17.2

Experimental Features

BTW, I've already done a reset, and it made no difference.

thanks, just in order to diagnose this issue further: does this issue reproduce in firefox safemode as well?

Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

Yes, unfortunately it does do it in safe mode as well.

Thanks for all your time, Philipp.

Your user agent reports that you are using Windows NT 6.1 (Windows 7). Is this correct? I found a posting remarkably similar, even with the exact same popping as in the video, but that was on Windows XP. Still, if you want to check it out: http://www.bleepingcomputer.com/forums/t/252529/bubble-popping-noise/

I've been using IE instead for a little while, but just tried Firefox again, and the problem seems to have resolved itself. Not sure how, but not going to complain either.

Thanks to all who responded to my query.

Jen