Why does Brand Thunder open as a search engine when I open another tab

Question

I want firefox as my search engine. Ifthis is not possible google it is

Answer 1

There are two ways a page can take over the "new tab" page:
(1) Changing the new tab page setting in Firefox (e.g., by creating a user.js file that overrides your preference every time you start Firefox);
(2) Using an extension to override your new tab page setting.
Let's check those:
'''Clean up Extensions'''
Disable ALL nonessential or unrecognized extensions on the following page. If in doubt, disable:
orange Firefox button (or Tools menu) > Add-ons > Extensions category
If a link appears above a disabled extension to restart Firefox, you can do that as the last step after completing your review of the list.
'''Update New Tab Setting'''
(1) In a new tab, type or paste '''about:config''' in the address bar and press Enter. Click the button promising to be careful.
(2) In the search box above the list, type or paste '''newtab''' and pause while the list is filtered
(3) Double-click the '''browser.newtab.url''' preference and enter your preferred page:
* ''(i) Page thumbnails (default)'' => about:newtab
* ''(ii) Blank tab'' => about:blank
* ''(iii) Built-in Firefox home page'' => about:home
* ''(iv) Any other page'' => full URL to the page
Press Ctrl+t to open a new tab and verify that it worked. Fixed?
'''Check for and remove a user.js file'''
To prevent your change from being reverted the next time you start Firefox, check for this files in your Firefox settings folder (also known as your Firefox profile folder). This article describes how: [[How to fix preferences that won't save]].
That should do it!