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It is a Firefox-specific error and won’t appear in any other browser. It is likely that the images and CSS are not loading as the cert errors from those domains prevent the resources from being transmitted.The PR_END_OF_FILE_ERROR error message appears when the Mozilla Firefox browser can’t establish a secure connection. This might be something to do with the proxying process.ĮDIT: As Arminius astutely pointed out, pages loading as plain text is likely due to certificate errors happening with resources being pulled from third party domains.
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I have no idea why some load as plain text. I would imagine that your traffic is being intercepted by a transparent proxy server which is inspecting your traffic (note that looking at the certificate information will reveal whether or not this is a certificate that your work has pushed out).Īssuming again, but your work is probably explicitly not filtering financial website traffic - presumably to avoid any potential liability with doing so. Traditionally, SysAdmins will push out certificates through Group Policy, which works for both Chrome and IE / Edge but Firefox won’t trust it. There is a lot to unpack so I’ll do my best here (based on some assumptions).įirefox maintains its own certificate store which is likely the reason only Firefox is throwing these errors. *Note: While iCloud did not report any security errors, the page did eventually fail to load with a connection error. Why do some pages not report security errors, but only load as plain text?.Why isn't Firefox reporting security errors on banking and financial websites?.Why is Firefox the only browser reporting these security errors?.While HTTPS scanning can at least partially explain the HTTPS security errors, the situation still leaves me with a few questions. It's worth restating that these security errors are happening on a work-issued laptop, meaning that my employer is most likely scanning HTTPS traffic. I am able to load Mozilla's support page and Wells Fargo without security errors, but the pages render as text without any images or formatting.( Concerningly, a majority of the sites which load without reporting any security errors are related to online banking and finance).A select few sites load in Firefox without reporting any security errors, including Discover, Visa, Mastercard, Chase, American Express, Citibank, Capital One, Bank of America, PayPal, Stripe, Intuit, TreasuryDirect, iCloud*, Discord, and YouTube.22139 report security issues on any of the listed websites There are a few things worth noting about these errors. "The owner of Firefox has configured their website improperly"Īfter browsing a bit more, I noticed that Firefox wasn't just reporting errors for Mozilla.įirefox is reporting HTTPS security errors for Google, Microsoft, Dropbox, GitHub, Wikipedia, LastPass, Netflix, Facebook, Twitter, Skype, WhatsApp, WolframAlpha, Amazon, LinkedIn, AutoHotkey, Yahoo, Imgur, and even Stack Exchange. After installing Firefox 54.0.1 on my work laptop, the first page I see warns me that "Your connection is not secure" when opening.