XULRunner Profile was last used with a newer version

[DiggaDigga2010]

Hello. So I found this bug on Firefox. Whatever I do something like watch a video, this message shows up reading:
This profile was last used with a newer version of this application. Please create a new profile.
So I don't know why this is happening, this is very annoying for me. How do I fix this issue from occurring? Thanks!

[jscher2000]

Does this occur when first starting Firefox or when you are already using Firefox and you launch a new page/window from within your existing session?

[therube]

XULRunner?

What versions of FF do you have?
And it sure sounds like you're (attempting) to run some old version, & some more recent version - with the same Profile.

Create separate Profiles (Profile folder) for each & do not intermix them.

[morat]

The error message is in the CheckDowngrade function in the release build.

Reference
http://searchfox.org/mozilla-release/se ... kDowngrade

Is the user trying to run a profile from the future?

Bug 1610712 comments
http://bugzilla.mozilla.org/show_bug.cgi?id=1610712#c1
http://bugzilla.mozilla.org/show_bug.cgi?id=1610712#c9