Please provide a screenshot of what you are talking about.

https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem

It is best to use a compressed image type like PNG or JPG to save the screenshot and make sure that you do not exceed a maximum file size of 1 MB.

Then use the Browse .... button below the Post a Reply text box to upload the screenshot.

My print screen button doesn't work, but there's an easier way for you and anyone to see what I am talking about. Simply open a new tab, either you'll get a page with a bunch of empty (probably full webpage links, depending on how often you clean Firefox.) If it's blank look for a gear in the upper right hand screen. The only settings are enhanced, classic and hide. If I could have figured this out I wouldn't have posted my previous comment to start with.

Do you want a totally blank page when you open a New Tab? If so, type this in the Location Bar and hit Enter.

about:config - accept the warning message

Filter this pref - browser.newtab.url and then right-click that pref. Select Modify - type about:blank as the new value. Restart Firefox.

Or you can use this extension for more options with NewTab. https://addons.mozilla.org/en-US/firefox/addon/new-tab-tools/

Create this Boolean pref on the about:config page to prevent Firefox from generating thumbnails for the about:newtab page.

• browser.pagethumbnails.capturing_disabled = true

Delete the thumbnails folder in the cache location of Firefox profile folder to remove already stored web page thumbnails.

• C:\Users\<user>\AppData\Local\Mozilla\Firefox\Profiles\<profile>\

.....

• https://developer.mozilla.org/Mozilla/Preferences/Preference_reference/browser.pagethumbnails.capturing_disabled

See also this article about the New Tab page (about:newtab):

• https://support.mozilla.org/kb/new-tab-page-show-hide-and-customize-top-sites

You can change the order of the boxes on the about:newtab page and drag an item to a different tile to pin it to that position or you can remove a website by clicking the close X to block that URL. You can drag a bookmark or history item and drop them in a tile on the about:newtab page to pin them and have your own favorites sites showing.

Changes made manually on the about:newtab page are stored in prefs that you can find on the about:config page.

• browser.newtabpage.pinned stores websites that you have pinned to a tile.
• browser.newtabpage.blocked stores websites that you have removed by clicking the X button in a tile.