Hmm, Firefox's normal new tab page displays a search bar connected to your default search engine (Change your default search settings in Firefox) and thumbnails/tiles of pages from your history. If you are getting a Bing page there, one of your extensions may be injecting that. Do you have any unknown or unwanted extensions? You can check on the Add-ons page, either:

• Ctrl+Shift+a
• "3-bar" menu button (or Tools menu) > Add-ons

In the left column, click Extensions. Then, if in doubt, disable.

Often a link will appear above at least one disabled extension to restart Firefox. You can complete your work on the tab and click one of the links as the last step.

Does that restore the default behavior?

Which brings me to: in Firefox 41 and later, you need an extension to change the new tab page.

Here are some options (I learn of more all the time):

• If you already use either the "Classic Theme Restorer" or "Tab Mix Plus" extension: There is an option somewhere (!) in its extensive settings dialogs to select a different new tab page.

• If you want to use your home page on the new tab: Try https://addons.mozilla.org/firefox/addon/new-tab-homepage/

• If you want to set a different page or a completely blank page: Try https://addons.mozilla.org/firefox/addon/new-tab-override/

• If you want the cursor to move into a search box in the page: Try https://addons.mozilla.org/firefox/addon/custom-new-tab/

Please only use one of these methods at a time, otherwise there may be conflicts and dysfunctionality.

Setting up New Tab Override and Custom New Tab

After installing one of these extensions, you need to use its Options page to set the desired new tab page (instead of using about:config).

Open the Add-ons page using either:

• Ctrl+Shift+a (Mac: Cmd+Shift+a)
• "3-bar" menu button (or Tools menu) > Add-ons

In the left column, click Extensions. Then on the right side, find New Tab Override or Custom New Tab and click its Options button. (See first screen shot attached.)

New Tab Override

Depending on the height of your screen, you may need to scroll down to enter the desired address into the form. (See second screen shot attached.) For example:

• Page thumbnails (default) => about:newtab
• Blank tab => about:blank
• Built-in Firefox home page => about:home
• Any other page => full URL to the page

Then tab or click away from that form field and you can test using Ctrl+t.

Custom New Tab

Entering your preferred home page address is simple. If you do not check either of the boxes, the extension will set the focus in the page so, for example, the cursor will be in the Google search box. (See third screen shot attached.) I had to exit Firefox and start it up again before Custom New Tab started working, but this may have been due to testing so many extensions back-to-back.

Success?

You can update to Firefox 42.0 that has been released a few days ago.

• Help > About
• https://www.mozilla.org/en-US/firefox/42.0/releasenotes/

Note that your System Details List shows multiple Adobe Reader plugins.

1. Adobe PDF Plug-In For Firefox and Netscape 10.1.16
2. Adobe PDF Plug-In For Firefox and Netscape 11.0.13

You can find the installation path of all plugins on the about:plugins page.

• http://kb.mozillazine.org/Issues_related_to_plugins#Identifying_installed_plugins