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 ?