Tried to open Private browsing and get message "the url is not valid and cannot be loaded"

up graded Firefox directly from older version to latest version and problem cropped up. Latest version on my laptop which is out of service and in shop works fine and on my net book works fine. Should I have done it in steps?

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.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
See also:
*[[/questions/908165]] The URL is not valid and cannot be loaded

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Private Browsing function is suddenly not working. Error message :"The URL is not valid and cannot be loaded." How can I repair?

Private Browsing function is suddenly not working. Error message :"The URL is not valid and cannot be loaded."
How can I fix it?

Start Firefox in [[Safe Mode]] to check if one of the extensions 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

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

I get continously "THE URL IS NOT VALID AND CANNOT BE LOADED" whereve I am, my homepage or sites I have been using always

Since I downloaded the last Firefox version 3.6 15, no matter where I am, I am back in my homepage and I get the message "The URL is not valid and cannot be loaded", usually I can go back to the site I was in and keep doing whatever I was doing, but often it will happen again.
This is happening in both my computer, laptop and desktop, one has windows XP, the other one has windows 7.
Suggestions? It is becoming a nuisance being moved from the tab I am, and kicked back to the homepage tab

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]]

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.

Why do i keep getting box: The URL is not valid and cannot be loaded.

When changing web sites, a dialog box pops up every time Saying "The URL is not valid and cannot be loaded".

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).
* Don't make any changes on the Safe mode start window.
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.
* 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")

What causes me to keep getting the message "the url is not valid and cannot be loaded" quite often, especially on MSN homepage among others?

I get this message quite often. I know the urls are valid because I visit the websites everyday. People have told me that maybe Firefox just doesn't support those websites very well and to try a different browser. It's driving me crazy. Any ideas?

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")

Why do I get error message "The URL is not valid and cannot be loaded" when everything looks OK?

This message pops up while using programs like yahoo mail. I delete it and everything continues as normal.

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).
* Don't make any changes on the Safe mode start window.
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.
* 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")

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.

I am getting an Alert, that says, "The URL is not valid and cannot be loaded.

Can't think of anything else to say.

i get the same message, "The URL is not valid and cannot be loaded.".
i've narrowed it down a bit more.
i've got a freshly installed firefox US 9.0.1 on a freshly installed windows xp pro sp3 US (fully patched). a freshly installed separate firefox 3 install is on this machine too, but that does not seem relevant.
the problem only occurs when i load https-urls with invalid certificates (eg self-signed) in the case that i use a firefox with a non-default profile.
so the "default" profile displays a "this page cannot be trusted" screen as expected, i can open the url. but in a different firefox instance/profile, when going to the same https url, i get the error popup. the firefox profile/instance is started like this: firefox.exe -P dev -no-remote.
i have reinstalled firefox 9 & 3 because of this issue. the problem stayed. i didn't remember whether i could load the https url with the default before the reinstall. perhaps i couldn't...

The URL is not valid and cannot be loaded. This statement comes up on almost any attempt to log into or click a link to anything at least on 2 tries, then the site comes up. what's up with this?

firefox v 3.6.13 is what I use. If I select something from "read Later" or a link from the home page to another site, I get that message - The URL is not valid and cannot be loaded. in a box that pops us a couple of times, then the site I want.

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.

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

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

Why do I keep getting an error message that reads "The URL is not valid and cannot be loaded."

Whenever I click on a link that opens a new tab using "about:tab", an error pops up. The error box is titled "Alert" and the message reads "The URL is not valid and cannot be loaded."
However, once I click OK, the page loads just fine. At first, I thought it might be one of my add-ons (Iuse a bunch), but it still occurs after restarting in Safe Mode. Any thoughts?
I can even create the problem without clicking on a link inside a page if I simply type about:tab in the address bar.
I am using Firefox 12.0

Wow! I actually solved this on my own. I didn't find any thread that helped, but after reading a few, I figured poking around in about.config would help... and it did!
Here is how I solved the problem:
# Typed '''about:config''' in address bar.
# When I got to the warning about voiding the warranty, clicked '''I'll be careful, I promise!'''
# I found the setting entitled '''browser.newtabl.url''' (use the '''Search:''' box).
# I double-clicked on the entry entitled '''browser.newtabl.url''' and deleted the info in the value portion.
# Clicked '''OK'''.
# Closed the tab.
# Restarted Firefox and problem was solved.

Tried to open Private browsing and get message "the url is not valid and cannot be loaded"

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