When I open a new tab, an error message appears. I click "OK" on the error message, and the tab opens.
Every time Firefox opened
== I open a new tab
The error message says : [Exception... "Component returned failure code: 0x804b000a (NS_ERROR_MALFORMED_URI) [nsIWebNavigation.loadURI]" nsresult: "0x804b000a (NS_ERROR_MALFORMED_URI)" location: "JS frame :: chrome://global/content/bindings/browser.xml :: loadURIWithFlags :: line 186" data: no]
The original poster is "Olivier Benet" and then I see a reply from "ailein" are you two the same person? It's important to know, because the two of you may not be having the same problem.
Mozilla/5.0 (Windows; U; Windows NT 5.1; fr; rv:220.127.116.11) Gecko/20100625 Firefox/3.6.3;MEGAUPLOAD 1.0
You have or had an extension installed (MegaUpload toolbar) that has changed the user agent from Firefox/3.6.6 to Firefox/3.6.3.
You can see the Firefox version at the top and the user agent at bottom of the "Help > About" window (Mac: Firefox > About Mozilla Firefox).
You can check the general.useragent prefs on the about:config page. You can open the about:config page via the location bar, just like you open a website. Filter: general.useragent If general.useragent prefs are bold (user set) then you can right-click that pref and choose Reset.
See Web sites or add-ons incorrectly report incompatible browser and Find what version of Firefox you are using
See also http://kb.mozillazine.org/Resetting_your_useragent
I am french and I did not understand everything.
My problem is solved.
When Firefox has Started the next day, I did not have this problem.