In what way is this website broken for you as it seems to be working fine for me ?

Can you attach a screenshot?

• https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem
• use a compressed image type like PNG or JPG to save the screenshot

You can try these steps in case of issues with webpages:

You can reload webpage(s) and bypass the cache to refresh possibly outdated or corrupted files.

• hold down the Shift key and left-click the Reload button
• press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• press "Command + Shift + R" (Mac)

Clear the Cache and remove the Cookies for websites that cause problems via the "3-bar" Firefox menu button (Settings), click the padlock icon (Clear cookies and site data) for the domain in the selected tab.

"Remove the Cookies" for websites that cause problems:

• Settings -> Privacy & Security
  Cookies and Site Data: "Manage Data"

"Clear the Cache":

• Settings -> Privacy & Security
  Cookies and Site Data -> Clear Data -> [X] Cached Web Content -> Clear

• https://support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox
• https://support.mozilla.org/en-US/kb/how-clear-firefox-cache

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or if userChrome.css/userContent.css is causing the problem.

• switch to the Default System theme: "3-bar" menu button or Tools -> Add-ons -> Themes
• do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window

• https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

You can check for issues with Enhanced Tracking Protection. Firefox shows a purple shield instead of a gray shield at the left end of the location/address bar in case Enhanced Tracking Protection is blocking content.

• click the shield icon for more detail and possibly disable the protection

You can check the Web Console for relevant-looking messages like blocked content.

• https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop
• https://support.mozilla.org/en-US/kb/total-cookie-protection-and-website-breakage-faq
• https://support.mozilla.org/en-US/kb/trackers-and-scripts-firefox-blocks-enhanced-track

Hello @cor-el, and thank you for the detailed reply. I will respond to each of your suggestions in order.

How it's broken: 1. The price quote graph does not display 2. The "report broken site" feature doesn't work (as I described) 3. Firefox screenshot doesn't work. Right-clicking on the page gets no response; and ctrl-shift-S does nothing. 4. See also this post that I made about the actual page (vs. about the "report broken site" feature: https://support.mozilla.org/en-US/questions/1445006.

I have attached a screen shot showing the missing graph.

Reloading the page with ctrl-reload gets me a new tab that's entirely blank. There's a little dot next to "New Tab" that moves back and forth but the tab never loads. The other methods for reloading that you suggested do nothing.

Clearing cookies/cache is ineffective; in fact, using a brand new profile or using a private window are both ineffective.

Troubleshoot mode did not help; the problem persisted.

The new profile I created used the default system theme; there was no change.

Turning off Enhanced Tracking Protection did nothing to improve things. (See my screen shot.)

I'm not sure how to check the Web Console. None of the pages you linked to contains anything about a "console".

So unfortunately, none of those suggestions improved the situation.

It appears to me that whatever's breaking the web page is also breaking some other things, like the "report broken page" function and the right-click menu.

Thanks again for your reply; but it appears that further diagnostic information is needed. If you have any suggestions on how to obtain that, I'd certainly be willing to try them.

Make sure you stay signed out of sync in the new profile.

Try changing DNS over HTTPS (DoH) to "Off" or "Max Protection" and in Connection Settings change "Use system proxy settings" to "No proxy".

Disable any third-party antivirus or security software, this may require rebooting in Windows Safe Mode (networking enabled).

For the Web Console, see:

• https://firefox-source-docs.mozilla.org/devtools-user/web_console/

You can also check the Timings in the Network Monitor.

• https://firefox-source-docs.mozilla.org/devtools-user/network_monitor/

Hello again, @cor-el. I'm not sure how to follow the instructions on the web console page.

--- Quote You open the Web Console from a menu or with a keyboard shortcut:

   Select the Web Console panel in the Web Developer Tools, accessible from the Browser Tools submenu
   Press the Ctrl + Shift + K (Cmd + Opt + K on OS X) keyboard shortcut.

--- end Quote

ctrl-shift-K does nothing. If I select the Web Developer Tools menu, I get a black box (see screen shot).

Again, it seems to me that the broken-ness of this page also breaks lots of Firefox functionality. It's awfully hard to diagnose when diagnostic information is inaccessible.

Does it still happen in a new profile? An easy way to test a new profile is to install Developer Edition and see if it happens there or refresh your existing profile. Make sure you stay signed out of your sync account when testing.

I believe I have found a way to reproduce this problem consistently.

If I get to the Yahoo Finance quote page through a search engine result (i.e. I search for, say "Diageo stock", then right-click and "open link in a new tab" or "open link in a new window" or "open link in a new private window"), the page fails as I've described. In fact, if (on the search engine results page) I right click and copy the target link, then open a new tab and "paste & go" in the new tab, it fails as well.

What I just said is true for search results from Google, Bing, and DuckDuckGo.

On the other hand, if I copy the URL from the URL bar on the broken page, open a new tab, and "paste & go" using that link, the graph gets displayed properly.

It would appear that Firefox's handling of the links returned by search engines -- or handling opening the link in a new tab/page -- is somehow buggy, and causes the page to fail in the described way.

Any thoughts on how I might prove that definitively, so that I can submit a meaningful bug report?

@zeroknight -- Thanks for your reply. Yes, it still happens in a new profile. I don't use sync, so that's not a factor. Changing the proxy settings to Off did nothing (FWIW, I don't use a proxy anyway). Changing the DNS settings to "Off" or "Max Protection" did nothing as well.

You can do a malware scan, just to be sure.

• https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware

Do a clean reinstall of the current Firefox release and delete the Firefox program folder before installing a fresh copy of the current Firefox release.

• download the Firefox installer and save the file to the desktop
  *https://www.mozilla.org/en-US/firefox/all/#product-desktop-release

If possible uninstall your current Firefox version to cleanup the Windows Registry and settings in security software.

• do NOT remove "personal data" when you uninstall the current Firefox version, because this will remove all profile folders and you lose personal data like bookmarks and passwords including personal data in profiles created by other Firefox versions

Remove the Firefox program folder before installing that newly downloaded copy of the Firefox installer.

• (64-bit Firefox) "C:\Program Files\Mozilla Firefox\"

• it is important to delete the Firefox program folder to remove all the files and make sure there are no problems with files that were leftover after uninstalling

Your personal data like bookmarks is stored in the Firefox profile folder, so you won't lose personal data when you reinstall or update Firefox, but make sure NOT to remove personal data when you uninstall Firefox as that will remove all Firefox profile folders and you lose your personal data.

If you keep having problems, you can create a new profile as a quick test to see if your current profile is causing the problem.

• https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data
• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles

Reinstall Firefox

• https://support.mozilla.org/en-US/kb/troubleshoot-and-diagnose-firefox-problems

I regularly do malware scans; but I did one and no malware was detected.

I uninstalled FF, deleted the Program Files folder, and reinstalled. The problem persists.

I then created a new profile, and the problem persists.

Chris, definitely file a bug on this listing your steps to reproduce this bug at bugzilla.mozilla.org. You tried everything I could possibly think of, for which I salute you! But you forgot to share your search results links from Google & Bing that are giving you this trouble. I don't think DDG adds extra garbage to search result urls but if it does, share its link too. With those links, we might also be able to reproduce the breakage you're seeing.

One other thing I noticed is that you have Norton 360 installed. Norton has been notorious for causing all sorts of problems with Firefox over the years. Mostly for deleting or corrupting data in Firefox. Even browser hangs/freezes & crashes. But this time I think its intercepting your connections to Yahoo & screwing them up somehow. Try disabling Norton 360 & test again.

If no change, please disable any VPN or AV (Kaspersky, AVG, Avast, BitDefender, Sophos, etc) you might be using. Because I get the strong sense a 3rd party application is intercepting Firefox browser connections & possibly stripping out data. You could also have a look in Task Manager & disable any other security apps or 3rd party firewalls you notice running. Even something that looks innocent, try disabling it & then redo your search results test to see if anything changes.