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Tabs say File Not Found

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I often open PDF links in Firefox. I can choose to open the PDF in a Firefox tab. If I leave the tab open and restart my computer, or look for that tab sometime in the future, I often see a page that says File not found (see picture). Somehow the page is being cleared out of the cache. Not sure if Firefox is doing this, Windows or some other program. Any ideas to keep these pages so I can see them in the future?

I often open PDF links in Firefox. I can choose to open the PDF in a Firefox tab. If I leave the tab open and restart my computer, or look for that tab sometime in the future, I often see a page that says File not found (see picture). Somehow the page is being cleared out of the cache. Not sure if Firefox is doing this, Windows or some other program. Any ideas to keep these pages so I can see them in the future?
Attached screenshots

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The file is in a temp folder. A simple test would be to have windows explorer open to that temp directory from your screenshot. see screenshot Have everything open like before in the tab, reboot the computer, and then see if that temp folder is empty when you log back in.

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For me on Linux, pdfs are downloaded to my downloads folder and then opened in Firefox(It's different in Nightly). see screenshot So I can reboot the computer or just restart the browser and the tab with the file will be there.

Modified by jonzn4SUSE

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