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Open Firefox
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Go to Menu (☰) → Settings → Applications
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In the search bar, type PDF
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Look for Portable Document Format (PDF)
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Change the action from Open in Firefox to Use Adobe Acrobat Reader
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Close the settings tab.
Open Firefox
Go to Menu (☰) → Settings → Applications
In the search bar, type PDF
Look for Portable Document Format (PDF)
Change the action from Open in Firefox to Use Adobe Acrobat Reader
Close the settings tab.