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Sometimes your PDF is not opening properly, to fix that follow the steps below
1- Open Firefox and then click on the menu icon at the top right corner.
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2- From the dropdown menu, click on “Options.”
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3- After clicking on “Options,” a page will appear where you can search for applications.
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4- Then search for PDF
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5. Under the actions column, make sure A PDF viewer is selected
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You are now all set and ready to proceed.