When I open a new tab I get the following error message: Firefox can't find the file at /C:/Users/Tanisha/AppData/Local/TNT2/2.0.0.1128/pinnedSearch.htm."

I can still browse websites, but I want to know what is causing this error message.

hello tanisha625, it looks like some program has overwritten the default new tab page. you can either install the [https://addons.mozilla.org/firefox/addon/searchreset/ searchreset addon] to get rid of the problem or manually reset the page that opens on each new tab.
enter '''about:config''' into the firefox location bar (confirm the info message in case it shows up), search for the preference named '''browser.newtab.url''' and double-click & change its value to '''about:newtab'''.

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