User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:42.0) Gecko/20100101 Firefox/42.0 Build ID: 20151029151421 Steps to reproduce: Take an image and drop it onto the desktop(amount varies but is within the single digits) Actual results: the browser freezes fully. A popup shows telling me that shock-wave flash has become unresponsive. even with no instance of flash running. I can click "stop script" but it will just remain in an endless loop with the popup continuing to appear. instead i had to force kill the browser. Expected results: nothing, it should have just let me continue my browsing.

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0 Build ID: 20151125030231 Works fine for me using the latest Nightly on Windows 10. Reporter, could you please let me know if you are still seeing the issue when: - starting Firefox in safe mode https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode - starting Firefox with a new profile https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles - starting Firefox after a reset https://support.mozilla.org/en-US/kb/reset-firefox-easily-fix-most-problems

Tried them all already, does it even when in safe mode.

Please post you Graphic section from about:support

Graphics Adapter Description AMD Radeon R9 200 Series Adapter Drivers aticfx64 aticfx64 aticfx64 amdxc64 aticfx32 aticfx32 aticfx32 amdxc32 atiumd64 atidxx64 atidxx64 atiumdag atidxx32 atidxx32 atiumdva atiumd6a atitmm64 Adapter RAM 4095 Asynchronous Pan/Zoom none ClearType Parameters Gamma: 2200 Pixel Structure: R ClearType Level: 100 Enhanced Contrast: 300 Device ID 0x67b1 Direct2D Enabled true DirectWrite Enabled true (10.0.10586.0) Driver Date 11-17-2015 Driver Version 15.300.1025.0 GPU #2 Active false GPU Accelerated Windows 9/9 Direct3D 11 (OMTC) Subsys ID 30811462 Supports Hardware H264 Decoding false Vendor ID 0x1002 WebGL Renderer Google Inc. -- ANGLE (AMD Radeon R9 200 Series Direct3D11 vs_5_0 ps_5_0) windowLayerManagerRemote true AzureCanvasBackend direct2d 1.1 AzureContentBackend direct2d 1.1 AzureFallbackCanvasBackend cairo AzureSkiaAccelerated 0 (#0) Error Too many dropped/corrupted frames, disabling DXVA to note, this happened only after the 42 update, ive even reinstalled flash fully and changed drivers for my gpu to the newest ones since it started, so it can be pinned on the browser update causing it somehow

I still can't reproduce this on the latest Nightly or Firefox 42 - tested with and without an enabled Flash plugin.