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I'd like to know if there is a setting that limits the number of PDF files which can be open at any point in time in the firefox or thunderbird browser. I have a large amount of PDF open in my browser and I like it. The problem is, after I open 20 (more or less) PDFs' , the browser would not open any more PDF files and I have to load it in a PDF reader or save on the disk.

I hope there is option in about:config but I do not find it. Any suggestion ?

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    In what capacity would Firefox refuse to open more PDFs? – Ramhound Mar 25 '15 at 12:49
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  1. Go to about:config (type about:config in Firefox's address bar and press Enter).
  2. Change the value of dom.workers.maxPerDomain to something bigger, e.g. 50. I tried 25 and it worked, but I don't see why a bigger value wouldn't also work.
  3. Restart Firefox.

Source

Note: I don't know whether changing the above-mentioned value has any other effects.

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