Hi boff.hiroshi, Try a Clean Install.

See this article for more details:

Firefox keeps crashing https://support.mozilla.org/en-US/kb/firefox-keeps-crashing-startup#firefox:win10:fx72

bp-4b166ac6-2917-4c3b-a05f-aa6270200119 Signature: xul.dll | BaseThreadInitThunk

Crash Reason EXCEPTION_ACCESS_VIOLATION_READ

inputhk.dll = inputhk dynamic link library NOTE: One Web Search Claims Malware

xul.dll = Firefox

You may have ad/mal-ware. Further information can be found in this article; https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware?cache=no

Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.

RobertJ said

Hi boff.hiroshi, Try a Clean Install. See this article for more details: Firefox keeps crashing https://support.mozilla.org/en-US/kb/firefox-keeps-crashing-startup#firefox:win10:fx72

To RobertJ

I tried it. However, I was not able to solve a problem. Thank you.

FredMcD said

bp-4b166ac6-2917-4c3b-a05f-aa6270200119 Signature: xul.dll | BaseThreadInitThunk Crash Reason EXCEPTION_ACCESS_VIOLATION_READ inputhk.dll = inputhk dynamic link library NOTE: One Web Search Claims Malware xul.dll = Firefox

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You may have ad/mal-ware. Further information can be found in this article; https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware?cache=no

Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.

To FredMcD

I tried it. However, I was not able to solve a problem. Thank you.

Many have reported issues using the 64bit Firefox. Install the 32bit version from; Download Firefox For All languages And Systems {web link}

FredMcD said

Many have reported issues using the 64bit Firefox. Install the 32bit version from; Download Firefox For All languages And Systems {web link}

To FredMcD

I tried it. However, I was not able to solve a problem. Thank you.

Start Firefox in Safe Mode {web link}

A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

Start your Computer in safe mode with network support. Then start Firefox. Try Secure websites. Is the problem still there?

http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode Starting Any Computer In Safe Mode; Free Online Encyclopedia

FredMcD said

Start Firefox in Safe Mode {web link} A small dialog should appear. Click Start In Safe Mode (not Refresh). Is the problem still there?

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Start your Computer in safe mode with network support. Then start Firefox. Try Secure websites. Is the problem still there?

http://encyclopedia2.thefreedictionary.com/Linux+Safe+Mode Starting Any Computer In Safe Mode; Free Online Encyclopedia

To FredMcD

I tried them. Firefox crashes in both "Firefox in Safe Mode " and "Win10 in safe mode". Thank you.