I loaded the link you posted above.

I also loaded this link:
http://classic.wunderground.com/cgi-bin/findweather/getForecast?query=27591&wuselect=weather

They are the same website. It shouldn't matter whether the wuselect=WEATHER is uppercase or lowercase letters.

Thanks for the quick reply. You missed the first of the "the 5 upper case letters." Your link has ".../getForecast...," not ".../getforecast...."

When comparing with what was shown on the Tools|Options - General tab, the only difference I ever found was the caps. I never stopped to think it was only a specific upper case letter that caused the problem. I normally have two Home Page tabs, but with only one Home Page it still only works one time (after I manually add the caps under Options). It works from Bookmarks (caps are retained). IE & Chrome retain the caps in the Home Page settings as well as Favorites/Bookmarks.

See attached screenshot.

I've known for years that URLs can be case sensitive beyond the domain. I guess most Websites are now designed so that these "switches" in their URLs are no longer case sensitive. Otherwise, I am sure that Firefox would have run into a problem with this before. I DID NOT HAVE THIS PROBLEM before the last FFX update, but it's possible that Wunderground changed something about the same time.

Works fine here I end up on the http://classic.wunderground.com/cgi-bin/findweather/getForecast?query=27591&wuselect=WEATHER page.

Do you see this incorrect entry in the location bar drop-down list if you start typing or pasting the first part of the wrong URL?

Use these steps to remove saved (form) data from a drop-down list:

1. click the (empty) input field on the web page to open the drop-down list
2. highlight an entry in the drop-down list
3. press the Delete key (on Mac: Shift+Delete) to remove it.

You can remove all data stored in Firefox from a specific domain via "Forget About This Site" in the right-click context menu of an history entry ("History > Show All History" or "View > Sidebar > History") or via the about:permissions page.

Using "Forget About This Site" will remove all data stored in Firefox from that domain like bookmarks, cookies, passwords, cache, history, and exceptions, so be cautious and if you have a password or other data from that domain that you do not want to lose then make a note of those passwords and bookmarks.

You can't recover from this 'forget' unless you have a backup of the involved files.

It doesn't have any lasting effect, so if you revisit such a 'forgotten' website then data from that website will be saved once again.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Firefox/Tools > Add-ons > Appearance).

• Do NOT click the Reset button on the Safe Mode start window.

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

When all letters are lower case, it does not work.

Try the following:

1. Go to about:config
2. Locate the browser.startup.homepage string
3. Edit the value of the string and try adding the uppercase letters required

Please report back soon.

Thank you for the long effort, cor-el, but if you'd spent half the time reading that you did writing (assuming the bulk of that was not boilerplate), you'd have seen the problem had nothing to do with History or the Location Bar type-down. The problem is the fact that the Home Page data does not save upper case letters.

I did what you said and even used "forget this site." However, when I correctly entered the URL and saved it as the Home Page, the caps were saved as lower case. It will work to correctly start the Home Page(s) over and over after that UNTIL I either open a different page (like this one) or restart FFX. After either of those actions, clicking Home Page (or starting FFX) will insert the URL without the caps and the error appears.

Restarting in Safe Mode does the same thing as hitting the Home Page button or restarting normally. The capital letters in the URLs are changed to lower case.

Have you actually TRIED this yourself?

Did as you said. Caps not saved. I went back to about:config after trying the Home Page button and it displayed there in lower case and not as I had entered.

Have you tried this yourself?

My homepage on my browser contains capital letters. They are saved correctly on mine.

When did this issue first occur.

If you do not keep changes after a restart or otherwise have problems with preferences, see:

• http://kb.mozillazine.org/Preferences_not_saved

Rename or delete the prefs.js file and possible numbered prefs-##.js files and a possible user.js file to reset all prefs to the default value.

Sorry, guy, but that is way too much trouble. In fact this whole process has been way beyond what it would take to just go to the page using a bookmark.

I'll just start using Chrome as my default browser. Firefox has gotten too weighed down with "features."

See reply to cor-el.

We are sorry to hear that you are leaving the Firefox community.
We are also sorry that the Mozilla Support Team could not help you solve your Firefox problem.
We wish you the best in the future and hope that someday you will return to Firefox.

Sorry for any inconvenience that Firefox has caused.

If you want to leave feedback for Firefox developers, you can go to the Firefox Help menu and select Submit Feedback... or use this link. (You'll need to be on the latest version of Firefox to submit feedback). Your feedback gets collected at http://input.mozilla.org/, where a team of people read it and gather data about the most common issues.

I found this was caused by the Norton Toobar in my case. Firefox 25.0.1, Windows 7 on one system, Windows 8 on another system.

The url I'm using is for a weather forecast site, and the url contains a reference to MapClick.php. The bug causes this to be changed to mapclick.php. I suspect this the php file name is case sensitive (it's probably located on a linux or unix server). Here's the correct URL: http://forecast.weather.gov/MapClick.php?lat=41.74828249999999&lon=-70.06222309999998&site=all&smap=1&searchresult=Brewster%2C%20MA%2002631%2C%20USA#.UpJbzuLJIrx

The problem takes a bit of fiddling to reproduce, but here's how I did it:

(Starting conditon: Firefox installed, Norton Security Suite or Norton 360 installed, and Norton Toolbar enabled in Firefox)
1. Start Firefox (FF)
2. Insert the URL above into the FF URL text box and hit return to connect to the website.
3. Use FF options to set the current page (from the URL above) to be the homepage.
4. Exit FF
5. Restart FF
- Note HTTP 404 error
- Note URL displayed in Firefox is all lower case, esp "mapclick.php"
6. Use FF options to disable Norton Toobar
7. Restart FF
- This step is what actually causes Norton Toolbar to be disabled
- Note that HTTP 404 error still occurs, because now the lower case version of the URL is still set as the FF homepage
8. Use FF options to re-set the home page to the correct URL (with mixed case MapClick.php)
9. Exit FF.
10. Start FF
- Note that the homepage now comes up correctly.
11. Use FF optons to re-enable Norton Toolbar
12. Exit FF
13. Start FF
- Note that HTTP 404 error occurs
- Note that URL now contains lower case mapclick.php

Further information:
- Firefox settings can be viewed by typing about:config into the URL text box. The setting named browser.startup.homepage is where the home page URL is set.
- Firefox writes a file called prefs.js each time it exits. Settings from about:config are stored in prefs.js. The prefs.js file is stored in a sub-folder of %APPDATA%\Mozilla\Firefox\Profiles. The homepage preference appears in the prefs.js line containing browser.startup.homepage
- If the Norton Toobar is enabled and a URL specified by browser.startup.homepage is modified to contain mixed case letters (e.g. MapClick.php), and the user then exits FF, prefs.js will be found to contain the URL with all lower case letters.
- The next time FF starts, the setting in prefs.js will be applied, resulting in the HTTP 404 error.

Forgot to mention the Norton version ...

On my Windows 7 system: Norton 360 Premier Edition V21.1.0.18

I also saw this recently (17-Nov-2013) on Windows 8, FF v25.x, with fresh install of Norton Security Suite provided by Comcast.

You should take this up with Norton.

• http://community.norton.com/t5/Norton-Internet-Security-Norton/bd-p/nis_feedback

I did report this to Norton. Apparently this bug affects IE as well, and they are tracking it down.

I just wanted to cross post here so FF users would know this is not a FF bug.

I DO Have Norton 360, version 21.1.0.18, and it was installed shortly before this post. BUT -- Not sure when I unchecked the Norton Toolbar, but I only did it because it was obnoxious & took up too much space. That Toolbar & Norton Vulnerability Protection are disabled. The problem with the disappearing caps went away -- probably about the same time, but I associated it with another change I made.

It is definitely the problem, though. I just turned the Toolbar back on and hit the Hoe button (on a new tab). Got the same error. Turned toolbar back off and corrected homepage and it works fine. I will add my me-too to the Norton thread you linked. Thanks!

BTW -- Nothing bad about Trend Micro. That license expired & had an extra Norton license.