Do you mean scripts and style rules from external files are being displayed in the source viewer? I've never seen that. Are you using the basic default source viewer or might an add-on be enhancing it?

A common way to test whether an extension is in play is to test in Firefox's Safe Mode where all extensions are disabled. You can invoke that using either:

If Firefox is not running: Hold down the Shift key when starting Firefox.

If Firefox is running: You can restart Firefox in Safe Mode using either:

• "3-bar" menu button > "?" button > Restart with Add-ons Disabled
• Help menu > Restart with Add-ons Disabled

and OK the restart.

Both scenarios: A small dialog should appear. Click "Start in Safe Mode" (not Refresh).

Any difference?

jscher2000 said

Do you mean scripts and style rules from external files are being displayed in the source viewer? I've never seen that. Are you using the basic default source viewer or might an add-on be enhancing it?

Yes, this is what is happening. Yes, I use the default source viewer. Restarting in safe-mode did not make a difference. Oddly enough, Mozilla's website shows external links for me. However, this seems like the exception because I wasn't able to find another site that also displayed external links.

That is normal for content that is embedded as a script or style tag in the page source. You shouldn't see this when a link to a file is used instead, but you will see all content that is part of the page source.

Except that I am seeing this when the files are linked. Here is an example of what I'm seeing on the current site I'm developing. This CSS file is linked, it is not embedded inline.

Thank you for testing.

When I try Reddit, that style sheet is not inlined into the page.

I can't access /browse on Netflix, I get redirected to a login screen. But it seems odd that when I try to browse around Netflix I am always on HTTPS and you loaded it on HTTP.

Does this problem only occur in HTTP pages, and not in HTTPS pages?

Is it possible that some kind of proxy or security filter is modifying the page before it reaches your browser?

jscher2000 said

Thank you for testing. When I try Reddit, that style sheet is not inlined into the page. I can't access /browse on Netflix, I get redirected to a login screen. But it seems odd that when I try to browse around Netflix I am always on HTTPS and you loaded it on HTTP. Does this problem only occur in HTTP pages, and not in HTTPS pages? Is it possible that some kind of proxy or security filter is modifying the page before it reaches your browser?

This was indeed the case, thank you for helping me solve this.