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Can not load Nightly. can not load error

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Can not load Nightly. can not load error. I spe hours trying to find solution without any cure. I went 6 months without Nightly.

About 2 weeks ago, I uninstalled Nightly again and found an old version that worked for 2 weeks until today. Update today and can't load.

The file has never existed on this computer. Please help. I've had enough of this ^%$%

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It could be the work of one of your add-ons, or even add / mal-ware.

Type about:addons<Enter> in the address bar to open your Add-ons Manager. Hot key; <Control>(Mac:<Command>)<Shift> A)

In the Add-ons Manager, on the left, select Extensions. Make sure you know what each one is and what it does.

Some added toolbar and anti-virus add-ons are known to cause Firefox issues. Disable All of them.

Also, check the programs that are on your computer

Windows: Start > Control Panel > Uninstall Programs. Mac: Open the "Applications" folder. Linux: Check your user manual.

Go thru the list. If you find something that you don't know what it is, use a web search.

Troubleshoot Firefox Issues Caused By Malware {web link}

Possible Mal-Ware Scan For Macs {web link}

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If none of the suggested troubleshooting works above: the other thing you can do is install a new version of Nightly. They update each day and sometimes experiments in updates go wrong.