To be honest, I never really pay attention to the Downloads history manager in Firefox, until pretty recently, out of curiousity while looking some random files that weren't there (which is another topic, but not my focus in this Support question). So, checking the Downloads history, I realized that I had a few archives (they were majorly image-type files, and they weren't many, maybe just 10-15 distributed in three months as I don't download much nowadays) that were marked down as "failed", for some reason. But, I go to my desktop's Downloads folder and, well, no one of these files looked like they had errors or similar (I opened them up in Paint, in the Photos? app from Windows 11, and I even opened them up in Firefox and I ran the antivirus on them, just to be sure they were fine). So, I decided to download "copy" files and, although, they '''''now''''' appeared as complete ("fine", "good") in the Downloads history manager, when opening them and contrasting them, I didn't see any kind of difference between the original file and the new one, they even shared the same property data and they looked the same, so, everything looked fine to me. These past few days I decided to observe the history manager a little more cautiously to see that every file I downloaded and/or saved were fine and complete (with the "X KB - download url link - time/day"), before I logged out from the session. But, early today I got slightly worried, so I opened Firefox again, and surprisingly, a few of the files I downloaded the previous session that were "complete", now were marked down as "failed" (it's a shame I couldn't screenshot them to indicate visual examples, but it really took me off guard when I digged up the history again). '''''Is this a bug or something?''''' I am a newbie when using Firefox as a browser, so this is the kind of things that intrigue me, because I also tend to open the private browser sessions and, for obvious reasons, I don't have access to the downloads list from them after I close the private window, and I imagine it would be the same situation in very normal circumstances if I used a normal browser window. So, basically, I want to know if this is a bug or something, because now you are leaving quite curious and worried that even any other of those files might have some errors or something, as well. This has NEVER happened to me with other browsers (like Chrome), if a file I saved, downloaded wrong - it downloaded wrong and I could even have a temp file in my Downloads folder - ''this is NOT the case''. (Btw - two things. This is an English translated version of the post I just did in Spanish for the Spanish-speaking language community, and I guess I wanted it to have a larger reach. Hopefully it is okay to do so. Also, although I indicate that my current Firefox version is the 134.0 version that got updated yesterday, January 8th, 2025, this happened before the launch of the updated version. I hope that I selected the right topic to describe this issue because I'm not sure how to describe it? It looks like a bug to me, I tried to look out for similar problems related to Downloads, but some of them do not apply to me (all my files do download, appear as downloaded in my desktop folder as well, and they do not seem to have any other issues, except for this thing in the Downloads history manager that I describe in the whole post) '''EDIT''': I tried to do a test, and lo and behold. I have screenshots that exemplify what I mean (more or less): these were the files I saved/downloaded before I closed the Firefox window, hence closing the session. The first is how they appeared in the Downloads panelm the second in the history manager window and the third one shows that one of the files I had to "download" again (although it's a copy from the original) because it appeared as it "failed" when I opened the Firefox window again (started a new session), and opened the Downloads history manager window.