FirefoxIt is a free, open source browser. Firefox has better search features and more powerful functions, but there are still some users who do not know how to use it. The following is the solution to the problem that Firefox cannot open PDF documents. :
1. Let’s first take a look at the error page when opening a PDF document using the Firefox browser.
2. Click the Start menu, enter the regedit command in the pop-up menu run box, and then press Enter to open the Registry Editor
3. Open the subkeys under the computer's HKEY_CLASSES_ROOT.pdf in the registry editor. You can see that it has been changed to WPS format.
4. Right-click the PDF subkey, select the Delete menu item in the pop-up menu, and then restart the computer.
5. After restarting the computer, open the Firefox browser and enter the about:support command in the address bar.
6. Open the "Troubleshooting Information" page, then click the "Refresh Firefox" button above and restart the Firefox browser.
7. After reopening the Firefox browser, click the "Options" icon on the More menu
8. Then in the options window that opens, find the application menu item. In the "Portable Document Format" item on the right, select the "Preview in Firefox" menu item, restart the firefox browser, and then find that you can use Firefox opens the PDF document.
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