When we connect to the internet or visit a new web page, a new tab opens and an alert pops up as follows: "The URL is not valid and cannot be loaded"

When we start the internet or navigate to a new page, a new tab opens with the following alert: "The URL is not valid and cannot be loaded." We "x" out of it, but a new tab, with the same alert appears. The problem occurs again when we try to navigate to another web page. A real nuisance. We've scanned the computer but found nothing but Adware cookies.
== This happened ==
Every time Firefox opened
== 5/20/10

Start Firefox in [[Safe Mode]] to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
See [[Troubleshooting extensions and themes]] and [[Troubleshooting plugins]]
If it does work in Safe-mode then disable all your extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
You can use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.
You have to close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

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Running Windows XP service pack 3. Updated Firefox from 8.0 to 9.0. Now when Firefox opens "The URL is not valid and cannot be loaded" is displayed in a window and no home page appears. What's wrong?

Running Windows XP service pack 3. Updated Firefox from 8.0 to 9.0. Now when Firefox opens "The URL is not valid and cannot be loaded" is displayed in a window and no home page appears. What's wrong?

That issue can be caused by an extension that isn't working properly.
Start Firefox in [[Safe Mode]] to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.com/kb/Safe+Mode
*https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes

I frequently get a "url is not valid and cannot be loaded" when I know the URL is valid

When searching or using previously validated bookmarks I frequently get an error message "url is not valid and cannot be loaded" How do I fix this?

You can modify the pref keyword.URL on the about:config page to use Google's "I'm Feeling Lucky" or Google's "Browse By Name".
* Google "I'm Feeling Lucky": http://www.google.com/search?btnI=I%27m+Feeling+Lucky&ie=UTF-8&oe=UTF-8&q=
* Google "Browse by Name": http://www.google.com/search?ie=UTF-8&sourceid=navclient&gfns=1&q=
* http://kb.mozillazine.org/keyword.URL
* http://kb.mozillazine.org/Location_Bar_search

When i try to load any page on Mozilla 28 the page opens but i get additional tab saying The address isn't valid The URL is not valid and cannot be loaded.

When i try to load any page on Mozilla 28 the page opens but i get additional tab saying The address isn't valid The URL is not valid and cannot be loaded. I tried everything from reseting Firefox ,completely new installation of firefox to about.config and nothing worked it's been two days now since the problem started and i am pretty frustrated and desperate as i try to fix the issue so please help me with some solutions????
Big thanks in advance

Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: 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
Delete a possible user.js file and numbered prefs-##.js files and rename (or delete) the prefs.js file to reset all prefs to the default value including prefs set via user.js and prefs that are no longer supported in the current Firefox release.
You can use this button to go to the Firefox profile folder:
*Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
*http://kb.mozillazine.org/Preferences_not_saved

When I open firefox I get this message; The address isn't valid The URL is not valid and cannot be loaded.

I get this message whenever I open firefox or a new tab. Anything I had tabbed to the top has gone, and the original homepage which shows all my recent visits is invalid. The full message is:
The address isn't valid
The URL is not valid and cannot be loaded.
Web addresses are usually written like http://www.example.com/
Make sure that you're using forward slashes (i.e. /).
Try Again.
Help mee!!!

Hi fredmcd-hotmail
It's not that I'm typing anything in wrong, it's when I first open Firefox or a new tab. Instead of displaying the firefox page showing my recently viewed websites it's just an invalid URL. Why would I be blocked from this page?
Thanks

Sometimes when firefox loads a web page the error message comes up stating The URL is not valid and cannot be loaded. And I know this is a valid web site. What gives?

This happens very often. When I open Mozilla sometimes I get an error stating that "The URL is not valid and cannot be loaded." When I click ok the site stops loading and the tab is titled untiled.

This can be a problem with DDE. 
See http://kb.mozillazine.org/Windows_error_opening_Internet_shortcut_or_local_HTML_file_-_Firefox

When I click on "Sign in to Sync" the page "about:accounts" shows error "The URL is not valid and cannot be loaded." How do I fix this so I can use Sync?

When I click on the three-bar icon (top right) and then on "Sign in to Sync" a new tab opens attempting to load "about:accounts" . . . the page that loads is an error . . . "Problem loading page" shows up on the tab and the page displays:
The address isn't valid
The URL is not valid and cannot be loaded.
Web addresses are usually written like http://www.example.com/
Make sure that you're using forward slashes (i.e. /).
Try again
I am running Firefox 30.0 on a Dell XPS-18 and Windows 8.0.
I cannot access "about:accounts" at all. How do I fix this?

The about:accounts page is a valid page in the current Firefox release.
Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
*Switch to the DEFAULT theme: 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 I click or type in a valid link, I get the message "The URL is not valid and cannot be loaded." I have to reload/refresh the page one or more times until the same page loads.

This happens with small sites as well as major ones such as amazon.com. It happens frequently with many different websites both when typing in a URL or clicking on one from search results or other pages. If I am opening it in a new tab, the page is blank and the correct URL shows in the address bar even though it didn't load. When I get the message "The URL is not valid and cannot be loaded" I have to click okay and then click on the link again or click refresh. Sometimes it loads on the 2nd try; other times I have to refresh multiple times to get it to load.
Anyone know what is causing this or what will help?

* "Clear the Cache": Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"
* "Remove the Cookies" from sites that cause problems: Tools > Options > Privacy > Cookies: "Show Cookies"
Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
* Don't make any changes on the Safe mode start window.
See:
* [[Troubleshooting extensions and themes]]
* [[Troubleshooting plugins]]
See also http://kb.mozillazine.org/Error_loading_websites (Error_loading_some_websites)

I am getting this error message, " The URL is not valid and cannot be loaded" when I try to go to Firefox home. I have uninstalled add-ons, uninstaleed and reinstalled a fresh new firefox which did not help

I am getting the following error message, " The URL is not valid and cannot be loaded" when I try to go to firefox home. I uninstalled add-ons , uninstalled Firefox and then installed a fresh version. Still have the problem.
Thanks for the help

That issue can be caused by a corrupted or incomplete Visual C++ installation (multiple versions can be installed side-by-side; SxS) that is missing some runtime components (Redistributable Packages) that Firefox depends on (problem with an embedded manifest file that specifies a specific runtime version).
You need to install the missing components (e.g. VisualC++ 2005 Redistrbutable).
* https://www.microsoft.com/download/en/details.aspx?id=5638
*[[/questions/908165]] The URL is not valid and cannot be loaded
*[https://bugzilla.mozilla.org/show_bug.cgi?id=713167 bug 713167] - Microsoft.VC80.CRT SideBySide errors, browsercomps.dll

When I click on the Home button, I get a message saying "The URL is not valid and cannot be loaded????????"

When I first turn on Firefox, I only get a blank "new tab". It does not go to the Firefox Home Page. When I click on the Home button in the top right, I get the message "The URL is not valid and cannot be loaded." How can I fix this so when I open Firefox it goes right to the Firefox Home Page (or a home page of my own choosing)??

[[How to set the home page]] has detailed instructions.
To get back to the default home page:
# At the top of the Firefox window, click on the Firefox button (Tools menu in Windows XP) and then click Options.
# Select the General panel.
# In the Startup box, click Restore to Default.
If this isn't "sticking", you may have malware or an extension that is preventing you from making the change.

After updating to firefox 9 when i click on the "home" icon i get an alert that the url is not valid and can't be loaded. Why?

my computer updated to firefox 9. update was ok, but now when i click on the "home" icon, i get an alert that the url is not valid and cannot be loaded. everything is good to go as far as web surfing and so forth, but i want the firefox start page as my home page. also the private browsing option won't work because of the invalid url.

Hi ozzie427,
What URL do you have bookmarked as your home page? You might want to look at the Knowledge Base article [[How to set the home page]]. There are steps in there to restore the home page to default. I would try that first to see if it clears up any strangeness. If that works, you can set the home page to anything you like.
Hopefully this helps!

My internet is on and I keep getting an alert window popping up saying the URL is not valid and can not be loaded?

I don't know what more details I can give you except for what I indicated. I am online and a window will pop up indicating the URL is not valid and can not be loaded. Make it stop! That's all! Furthermore you should not limit people on the length of their question. How can they explain it ?

Thats the annoying part! I have enough space and I'm putting things on a external hard drive and I keep deleting it off the computer.

When clicking on making a new tab it comes up with "The URL is not valid and cannot be loaded" how do i fix this

The URL is not valid and cannot be loaded keeps coming up whenever making a new tab. can not seem to fix have firefox 3.6.13

Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
* Don't make any changes on the Safe mode start window.
See:
* [[Troubleshooting extensions and themes]]
* [[Troubleshooting plugins]]
If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
* Use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.
* Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

The URL is not valid and cannot be loaded

seems like maybe firefox mishandles untrusted certificates?
It gives error: Alert The URL is not valid and cannot be loaded.
example:
https://notes.corp.cat.com/
other browsers can load this URL just fine. When I visit it in Firefox, I get the error in a simple little message box with a yellow triangle exclamation point, titled "Alert".
ALSO.... when I click the "Home" button in firefox, I get the error, and the home page does not load. Currently the home page is set to "Mozilla Firefox Start Page."
changing the home page to: http://www.google.com/ allows the home page button to work normally.
restoring the home page to default brings the error behavior back when clicking the home button.
changing the home page to: https://notes.corp.cat.com/ produces the same error, just like when I manually type in an https URL with a funky security certificate.
This problem only seems to happen on secure URLs with untrusted certificates, i.e. sites that are too cheap to pay to have their certificate registered with one of the certificate vendors or however the hell that works, so as a result every time you visit their web site, your browser starts to whine that it might be a forgery or whatever.
It used to be in Firefox that I could load these pages and just specify that I want to trust the site anyway. Now firefox gives this error that doesn't allow the user to know what is really going on or what the reason for the error is. It is as if the developers decided that users are too stupid to decide if they really want to visit the site or not, so as a result Firefox is just refusing to visit any web sites where the authenticity of the certificate can't be verified? Hey, it's not a bad idea, to be honest. :-) But it's kind of annoying, because here I am, sort of smart enough to know what I'm doing, but I don't have the choice in the matter...
I restarted with all add-ons disabled and that didn't help. I don't have much installled in the way of add-ons anyway. All I have is JAVA quick starter 1.0, and Adobe Acrobat, Java development toolkit, Java platform SE, Microsoft DRM, and Windows Media Player Plug-in Dynamic Link Library. Not even Flash. All the above is disabled now that I rebooted with add-ons disabled, and I still have the issue.
thanks for any help you can provide.

Please [https://bugzilla.mozilla.org/show_bug.cgi?id=713167 see this.] Installing [https://www.microsoft.com/download/en/details.aspx?id=5638 Visual C++ 2005 SP1] or the .Net Framework 3.5 SP1 may help mitigate the issue.

How do I enable Firefox 4 to do a search on more than one word (e.g. "yahoo mail") without receiving the error message "the URL is not valid and cannot be loaded"?

After loading Firefox 4.0, I changed the address bar search engine to Google Search by Name, so I'd be taken straight to the most relevant webpage when I type in a word.
It works fine when I type in one word, but if I use a search with more than one word (e.g. "yahoo mail" or "google maps") I get an alert saying "The URL is not valid and cannot be loaded". Is there any way I can fix the address bar to accept multiple word searches?
I've tried disabling all my add-ons, but it didn't make any difference.

Hi, this should sort out your problem:
1. Type in "about:config" into the address bar, this will open the settings menu. Click on "I'll be careful, I promise!"
2. Search for "keyword.URL" in the filter bar.
3. Enter "http://www.google.com/search?btnI=I%27m+Feeling+Lucky&q=" into the value field.
I'm no expert, but I had the same problem which got on my nerves after being so used to being able to type anything in, and following these steps fixed it.

When we connect to the internet or visit a new web page, a new tab opens and an alert pops up as follows: "The URL is not valid and cannot be loaded"

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