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Oh and I forgot, if you're fired with cause, you don't qualify for EI. You only get EI if you're laid off for lack of work.

Being fired for cause in this case refers to misconduct at the job, which is quite different from just being not good enough at your job.

I won't repost the list, but you can find the definition and the most common list on their website here:

You can dispute this, and in most cases you'll get the EI anyways.