➤ How to open PDF documents within Mozilla Firefox 🎮

From version 19 Mozilla Firefox has introduced an interesting new feature for Windows, Linux, Mac and Android: the integrated PDF viewer which will allow you to read PDF files without downloading or opening them with other programs or plug-ins.

How to open PDF documents within Mozilla Firefox

Here's how it works:

First, try opening a PDF found on the Internet, saved directly online: the new PDF viewer inside Firefox will open.
The button on the top left activates or deactivates the scrolling of the menu that gives access to the page previews: on the left the previews of all the pages that make up the PDF document appear. It is possible to jump to any page simply with a click of the mouse.
It is also possible to have another browser tab open directly on a document page: just right-click on the thumbnail of the preview and choose the first item.
At the top there are also other commands that are used to move around the document: you can go back and forth or jump to a certain page number.
At the top center is the menu for setting the exact percentage of text zoom; it is also possible to go by trial and error by selecting the commands + and -.
At the top right there are other commands: there is the possibility to exclude menus and parts of the browser e view full screen PDF only.
Also it is possible send the document to print directly from the browser, by selecting the printer icon.
Another important command is the one that allows you to download the document as a PDF file on your computer: has a document icon with a down arrow.

How to open PDF documents within Mozilla Firefox

Disable the built-in PDF reader

If you want to continue using your favorite program to view PDFs, and thus disable the built-in reader in Firefox, just follow these simple steps:

Open the browser settings, i.e. select the button at the top left, and in the menu that opens, choose the Options item.
In the settings menu that opens, go to the tab Applications: here it is necessary to look for the entry relating to PDFs in the list of supported extensions.
In the menu corresponding to the chosen item, select the name of a program useful for opening PDFs (for example Adobe).
There is also the possibility of completely deactivating the browser's PDF reader: write in the address bar of the browser "about: config”(Without the quotes), and press Enter on your keyboard.
Enter the settings of the browser, as happens when you put your hand in the Windows Registry, is a delicate operation, for this reason a warning alert appears: confirm and proceed.
Search the list for the key "pdfjs.disabled”: Once found, double click on this key.
At this point, in the box, it is necessary to set another value of the string, inserting the word "true"(Without quotation marks).

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