You have NVidia’s network access manager or Forceware Network Manager software installed. Disable / remove it. https://support.mozilla.org/en-US/kb/connectivity-crashing-firefox-43-update

How did you save the bookmarks?

If the errors happen again, post the full error here.

Try to click the Continue button to see if that makes the script finish properly.

Is this with restoring a JSON or HTML backup or are you importing data from another computer.

How large is this backup file?

FredMcD said

You have NVidia’s network access manager or Forceware Network Manager software installed. Disable / remove it. https://support.mozilla.org/en-US/kb/connectivity-crashing-firefox-43-update

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How did you save the bookmarks?

If the errors happen again, post the full error here.

cor-el said

Try to click the Continue button to see if that makes the script finish properly. Is this with restoring a JSON or HTML backup or are you importing data from another computer. How large is this backup file?

Thanks for the replys guys, no I do not have the software installed and I did try to continue the script. I tried both file types including the use of FEBE with no luck. The bookmark file size is 6,23 MB