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HowTo: Firefox Disable Default PDF Viewer / Plugin

I recently updated my Mozilla Firefox. Firefox now includes a built-in PDF viewer that allows me to see PDF files found on the web without a plugin. The built-in PDF viewer is enabled by default. However, I found that this pdf viewer is not working properly with various web-sites, and it works slowly. How do disable the built-in PDF viewer so that I can use the Adobe PDF viewer or other PDF viewer that is shipped with my operating systems?
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pdfinfo: Find Out PDF File Information From A UNIX / Linux Shell Prompt

Q. How do I find out more information about Portable Document Format (PDF) document from a shell prompt? How do I find out information such as what software used to create a pdf file, its page size, and its creation date etc, using the terminal?
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Linux: Convert a PDF File To an Image

Q. A friend showed me how to extract images from a pdf file using pdfimages utility. But I'd like to convert my PDF file to image file. How do I convert a PDF to an image file using a command line option?
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pdftotext: Linux / UNIX Convert a PDF File To Text Format

Question: I've downloaded configuration file in a PDF format. I do not have GUI installed on remote Linux / UNIX server. How do I convert a PDF (Portable Document Format) file to a text format using command line so that I can view file over remote ssh session?
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pdfimages: Extract and Save Images From A Portable Document Format ( PDF ) File

Q. How do I extract images from a PDF file under Linux / UNIX shell account?
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Find Files By Access, Modification Date / Time Under Linux or UNIX

I do not remember where I saved pdf and text files under Linux. I have downloaded files from the Internet a few months ago. How do I find my pdf or text files?
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