What's your Firefox version?

Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac=Options) key, and then starting Firefox. A small dialog should appear. Click Start In Safe Mode (not Refresh).

Is the problem still there?

While still in Safe Mode,

In the address bar, type about:crashes<enter>. Note: If any reports do not have BP in front of the numbers/letters, click it to Submit them.

The crash report is several pages of data. We need the report numbers to see the whole report.

Using your mouse, mark the most resent 7 - 10 crash reports, and copy them. Now go to the reply box below and paste them in.

(Please don't take a screenshot of your crashes, just copy and paste the IDs. The below image is just an example of what your Firefox screen should look like.)

If you can't get Firefox to open, you will have to do this the hard way. https://support.mozilla.org/en-US/kb/mozillacrashreporter Open the file browser / explorer on your computer. Note: You may have to enable Show Hidden Folders / Files. Enter this in the address bar;

Windows: %APPDATA%\Mozilla\Firefox\Crash Reports\submitted Win 7/Vista: C:\Users\<username>\AppData\Roaming\Mozilla\Firefox\Crash Reports\submitted Win XP/2000: C:\Documents and Settings\<username>\Application Data\Mozilla\Firefox\Crash Reports\submitted

Mac OS: /Users/<username>/Library/Application Support/Firefox/Crash Reports/submitted Linux: /home/<username>/.mozilla/firefox/Crash Reports/submitted

Copy the last 5-7 Recent File Names in the folder. Post the information in the reply box below.

Uninstalled firefox, tried to install new desktop version, it crashes upon installation. Will not start in safemode - crashes when I hold down shift key and double-click on firefox to open.

Info on last crash:

AvailablePageFile: 12449968128 AvailablePhysicalMemory: 4610351104 AvailableVirtualMemory: 4067057664 BlockedDllList: BreakpadReserveAddress: 390397952 BreakpadReserveSize: 67108864 BuildID: 20170125094131 CPUMicrocodeVersion: 0x1b CrashTime: 1486304643 InstallTime: 1485613879 ProductID: {ec8030f7-c20a-464f-9b0e-13a3a9e97384} ProductName: Firefox ReleaseChannel: release SafeMode: 1 SecondsSinceLastCrash: 53 StartupCrash: 1 StartupTime: 1486304643 SystemMemoryUsePercentage: 46 Throttleable: 1 TotalPageFile: 17143033856 TotalPhysicalMemory: 8553099264 TotalVirtualMemory: 4294836224 URL: UptimeTS: 2.443450223 Vendor: Mozilla Version: 51.0.1

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

File names: bp-e5bf0b2c-fd06-4a62-8036-a223a2170205.txt bp-d50cdd0d-ebaa-4199-b183-b23d82170205.txt bp-cc6727b1-06c6-40f7-b707-4e2422170205.txt bp-39e22e81-8ecb-4259-ae7f-aca9a2170205/txt bp-a7d0465c-e991-412b-be3c-d2cde2170130.txt bp-c866aaaf-a4ec-4b54-9e31-2dd252170130.txt

Thanks for all your help. I miss my browser.

Product Firefox Release Channel release Version 51.0.1 Build ID 20170125094131 OS Windows 10 OS Version 10.0.14393

bp-e5bf0b2c-fd06-4a62-8036-a223a2170205 Signature: klsihk.dll@0x4e60 +++++++++++++++++++++++++++++++++++++++++++++ klsihk.dll = AO Kaspersky Lab

Update Kaspersky. If the problem continues, disable it.