Any solution here? UP.

http://www.unikey.org/

Considering that UniKey application hasn't been updated for over two years and supports All Win32 platforms: Windows 9x/ME, Windows NT, 2000, XP, Vista, 7, 8, 8.1., my guess is that there is a compatibility issue with Windows 10 64-bit.

You posted here with - User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36

Check the Bug reports for that application: https://sourceforge.net/p/unikey/bugs/

And if you don't find one that covers your issue, file a Bug report on it.

Thank for answer my question but I very sure that my unikey is up to date and I can't find any solution about this in your Link you posted. Can you tell me how to have a bug report in firefox ?

I don't think that is a Bug with Firefox, but rather an outdated application that is being used on an unsupported operating system. And the last build available - UniKey 4.2 RC4, Build 140823 - wasn't even a full release version, it was a Release Candidate. IMO, that RC4 version was an update for a program that was discontinued / abandoned before the next release version came out.

Firefox Bugs can be filed here. https://bugzilla.mozilla.org/ See this first. https://developer.mozilla.org/en/Bug_writing_guidelines

Okie, I will try another version of Unikey, hope it sucessful, Thank for your help, I will post it's a solution if it can fix it.

I tried another unikey version ( 4.0 RC2 ). The problem still come. Reinstall firefox or unikey not fix this error. I don't know why? @@