Multiple icons in task bar
I have Firefox pinned to my task bar. Since updating to 9.0.1 when I click on the icon a second icon appears in the task bar. They both function properly. The second one shows tab previews of the first one but not visa versa. I have been through my options many times and can't find anything that covers this. It makes no sense to have duplicate icons which leads me to believe something is wrong. And if something is just a little wrong now it won't be long until it is very wrong. Is it something I did?
Chosen solution
Thank you for your suggestion. About:config had hundreds of prefs and I had no idea what any of them were about. My grandson offered a solution that was very simple and corrected the problem. I simply right clicked on the second icon and pinned it to the task bar then unpinned the first icon. Problem solved. He thought it was because the first icon was opening up a newer version of Firefox. Apparently he was correct. Thank you again for your suggestion. Now I know where all the preferences hide.
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Try to disable some browser.taskbar.*enable prefs on the about:config page.
See also Firefox/Tools > Options > Tabs > "Show tab previews in the Windows taskbar"
Chosen Solution
Thank you for your suggestion. About:config had hundreds of prefs and I had no idea what any of them were about. My grandson offered a solution that was very simple and corrected the problem. I simply right clicked on the second icon and pinned it to the task bar then unpinned the first icon. Problem solved. He thought it was because the first icon was opening up a newer version of Firefox. Apparently he was correct. Thank you again for your suggestion. Now I know where all the preferences hide.