Hello, today i installed metamask and set up many accounts. Roughly 10 hours later my metamask just crashed and disappeared from my extension toolbar bar. I restarted firefox to see if the problem would be fixed and the add on was still missing from the toolbar. I went into the add ons and themes settings and it was not installed to my surprise. I selected install and now it doesn't recognize my old wallet. I am certain it is the add on. I have the seed phrase, however from my understanding not all accounts appear when reentering the seed phrase. I am not sure what else to do in order to restore all of my old accounts attache to this seedphrase.

Why is this happening in firefox? Will it happen again if i continue to use firefox with metamask?