Zotero Connector add-on in firefox makes firefox lag

After I updated firefox to version 55.0.1, I found that Zotero within firefox could not be used any more. It requires Zotero 5 + Zotero Connector. After this, I found that firefox lag very often when opening new tab(s). Firefox most of the time just freeze for 5-10 seconds. Then I disabled all add-ons, then turn on one for each time, to see if which add-ons causing the issue. It seems Zotero Connector causing the problem.
I am not sure if you have the same problem. Maybe other problems rather than Zotero Connector?
Any idea? Thank you guys.
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