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Can't get Firefox to open a new tab as my homepage or a specific url. Alwatys get 'The address isn't valid'

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  • 8 have this problem
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  • Last reply by thespud1

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When opening a new tab, I keep getting 'The Address isn't valid'. Went through all the fixes given in previous threads, changing the url in about:config, running Firefox in safe mode (problem still exists with plugins disabled) resetting Firefox, changed newtab settings to about:home etc, restarted, deleted cookies. Nothing seems to work. Some other program seems to be overriding the Firefox settings. May be a virus. I am using the latest McAfee software.

I once had an add-on that brought up thumbnails with a new tab but I removed that a while back. On the right hand side search bar of firefox I can see that Bing is one of the dropdown search engine choices not that it should make a difference but I thougth they were sometimes a bit aggresive.

Anyhow, would love to know if there is a solution as it's making me suspicious of having an undetected visus or hijacking.

When opening a new tab, I keep getting 'The Address isn't valid'. Went through all the fixes given in previous threads, changing the url in about:config, running Firefox in safe mode (problem still exists with plugins disabled) resetting Firefox, changed newtab settings to about:home etc, restarted, deleted cookies. Nothing seems to work. Some other program seems to be overriding the Firefox settings. May be a virus. I am using the latest McAfee software. I once had an add-on that brought up thumbnails with a new tab but I removed that a while back. On the right hand side search bar of firefox I can see that Bing is one of the dropdown search engine choices not that it should make a difference but I thougth they were sometimes a bit aggresive. Anyhow, would love to know if there is a solution as it's making me suspicious of having an undetected visus or hijacking.

All Replies (4)

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This issue can be caused by an extension that isn't working properly.

Start Firefox in 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 or otherwise make changes.
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Thanks for your relpy but I've already tried these solutions and no joy. I tried them again there just to be sure but still no good.

In the mean time I installed a plug-in that does this for me. I used My Homepage 1.2 and it's done the business.

Still don't know what was causing the problem. (And it wasn't a typo, I checked and copied and pasted urls from other locations...)

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A possible cause is security software (firewall,anti-virus) that blocks or restricts Firefox or the plugin-container process without informing you, possibly after detecting changes (update) to the Firefox program.

Remove all rules for Firefox and the plugin-container from the permissions list in the firewall and let your firewall ask again for permission to get full unrestricted access to internet for Firefox and the plugin-container process and the updater process.

See:


Create a new profile as a test to check if your current profile is causing the problems.

See "Creating a profile":

If the new profile works then you can transfer some files from an existing profile to the new profile, but be careful not to copy corrupted files.

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I was able to get firefox to load a homepage by removing the about and just entering the page, ie gmail.com.