Problem with Firefox after updating: XML Parsing Error: undefined entity

I'm using Manjaro 17.1.3 with Plasma (aka KDE). After updating Firefox to 58.0 (and the other packages with this last upgrade from few hours ago) I had this error:

XML Parsing Error: undefined entity 
Location: chrome://browser/content/browser.xul
Line Number 1165, Column 7:      
      <menuitem class="pageActionContextMenuItem extensionUnpinned"

I also reported it to Mozilla

I "solved it" by using downgrate firefox to 57.0.4 and everything came to normal

It has already been mentioned:


Sorry, didn't find it, I'm closing this thread then!

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