Zotero 5 not working with firefox

I installed Zotero 5 after upgrading ubuntu and noticed that there is no longer any such thing as "zotero for firefox" now only "Firefox connector".

How am I supposed to save pdf's from the web to my zotero? When I open a pdf online and click the connector icon nothing happens. When I right click the pdf and select "save with snapshot" or "save without snapshot" nothing happens. It seems to work 1 out of 10 pdf files when "save to zotero (PDF)" option becomes available. What is going wrong the other 9 out of 10 pdf files?

I have installed zotero desktop and connector. The desktop zotero is running. In the plugin preferences it says: zotero status: zotero is currently available. Save to zotero.org is authorised.
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