Block by default doesn't work in Firefox

Same thing for me in Firefox, my default browser (currently 18.0.1, but the problem's been around for longer than that). I have Advanced -> Block New Elements by Default and General -> Enable library auto update both set, but sometimes when I go to various web pages, an unblocked entry will show up, along with the entries shown as being blocked. I then go to General -> 3pes -> Select All and Save, and then refresh the browser page, and the formerly unblocked entry will be blocked. So, auto-updating isn't working reliably for me, and hasn't been for months, or maybe a year.

Note: This topic was created from a reply on the "Block by default" doesn't work in Opera topic.
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