We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Can't install Quantum. End up with "The instruction at 0x3fe494e referenced memory at 0x00000000. The memory could not be read" error

more options

I uninstalled Firefox 56. Have downloaded Firefox Quantum and I get that error every time it opens or runs. Sometimes the referenced memory number changes slightly. -Things I have done: -uninstalled Firefox 56 -Uninstalled Firefox 57 (4 times now, complete uninstalls, including with Revo uninstaller) -Done several "clean" installs of Firefox 57

I'm at a loss at this point as to what to do.

I uninstalled Firefox 56. Have downloaded Firefox Quantum and I get that error every time it opens or runs. Sometimes the referenced memory number changes slightly. -Things I have done: -uninstalled Firefox 56 -Uninstalled Firefox 57 (4 times now, complete uninstalls, including with Revo uninstaller) -Done several "clean" installs of Firefox 57 I'm at a loss at this point as to what to do.

Saafara biñ tànn

can you try if installing the 32bit version from https://www.mozilla.org/en-US/firefox/all/ makes any difference?

Jàng tontu lii ci fi mu bokk 👍 2

All Replies (4)

more options

on what kind of device are you receiving that error?

more options

It's a desktop computer running Windows 7. It is a work computer, but I have full administrative rights on it.

more options

Saafara yiñ Tànn

can you try if installing the 32bit version from https://www.mozilla.org/en-US/firefox/all/ makes any difference?

more options

That worked. It installed fine.

Thank you -- I thought I had tried that already.