What I think I see is that Firefox is getting crashed/unable to start by a other program that has a issue.

So since had a power failure can you please follow this to correct any Windows 10 errors that maybe not allowing it to start as well good to correct errors if found and if not great we know it is not Windows : https://support.microsoft.com/en-us/help/929833/use-the-system-file-checker-tool-to-repair-missing-or-corrupted-system

You will need to find your profile to save if want bookmarks and for Firefox : https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data

If you can get Firefox running please refresh it to fix corrupted files : https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings

Alternatively if it is still not working I suggest uninstall it as per corrupted files from power failure and to install version 54.01 and restore your profile.

Suggest checking other programs like AV or Firewall programs that may be damaged also as they are sorta working with Firefox also so repair as needed.

Please let us know if this solved your issue or if need further assistance.

As to the power failure, you should run a full system check to look for contaminated system file.

Perform a System File Check to fix corrupted system files

Win 7, 8, 10, Vista: https://support.microsoft.com/en-us/kb/929833 Win XP: https://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/system_file_checker.mspx?mfr=true

Wiki - Windows 10 System File Check http://answers.microsoft.com/en-us/windows/wiki/windows_10-update/system-file-check-sfc-scan-and-repair-system-files/bc609315-da1f-4775-812c-695b60477a93

As to the crashes;

cmdshim32.dll = COMODO Internet Security 29Jun 17 This reported issue is caused by incompatibility with Microsoft Windows update KB4022716. Comodo teams is working over the fix. Dates of the Hotfix releases will be published later this week. Till that Hotfixes we strongly recommend users to not install mentioned Windows update KB4022716.