Extension automatically opens new tab

I have a linux version of firefox. When I open a second window for the first time in a session, one of my extensions to open a tab with a new tab. Is there a way to prevent this. I checked the new tab setting and about: config and found nothing. I also checked the folder where firefox stores the information profile and made a senior looks to reveal all the files including the url of the Web page of the extension.

The returned search hits in the following files

addons. JSON
addons.SQLite
Extensions. JSON
Extensions.SQLite
places.SQLite
sessionstore-backups/previous.js
sessionstore-backups / upgrade.js - 20150714173344
sessionstore-backups/recovery.js
sessionstore-backups/recovery.bak

Any advice on where I need to search?

You know that the extension is involved?

You shouldn't have any problem starting Firefox in Mode safe mode if the problem is really due to an extension. Take a look at this support article to start Firefox in Mode safe or to detect bad extension.

Maybe the defined extension new tab URL with the URL target when Firefox starts, and once the first new tab is opened, the extension put once again the new URL of the tab with the default this time.

Tags: Firefox

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