Search Engine Location Bug Rated 1 out of 5 stars

I'm using firefox in french and so my google search engine in omnibar is Google.fr .
Today I used google.com in english to make some searches, I selected it from my google.fr home page, with the link Google.com in English.
Since then my default Google search engine in the omnibar has been set to google.com !! Wathever the change I make in my google page (clicking back on "Go to Google France").
I tried to delete and reset the google search engine in the search engine menu of the bar but it stay Google.com .
The only way to come back to my default setting was to disable the omnibar, restart firefox and enable the omnibar again.
I try the same thing with another google, like the spanish one, but my default search engine in the bar stayed in french.
So the bug seems to be only with google.com .
Really really weird.
If somebody can check on his system...Thanks

I'm using firefox 3.6.13 and XP pro Sp3

This review is for a previous version of the add-on (0.7.2.20100912).