On the built-in home page, there are a selection of messages that can appear below the search box. If you reload the page (Ctrl+r or using the button in the address bar) once or twice, usually you will see a different message.

These are called snippets. If you NEVER want to see ANY snippets, some methods for accomplishing that have been posted over the past couple of years (I would need to do a search, or you can use this search: snippets + home).

It would be a little more challenging to block particular snippets, but I think that would be a good feature to add someday.

Mozilla shows rotating snippets on the about:home page to run different campaigns and these changes regularly.

If you prefer not to see snippets on the about:home page or if there are problems with a snippet then you can set this pref to an empty string value on the about:config page by deleting the current value via the right-click context menu (Modify) or a double-click.

• about:config page: browser.aboutHomeSnippets.updateUrl (delete current value)

Delete the storage\persistent\moz-safe-about+home folder in the Firefox profile folder with Firefox closed ("3-bar" Firefox menu button > Exit/Quit) to remove snippets stored in IndexedDB and make Firefox use a default snippet set.

You can reset the browser.aboutHomeSnippets.updateUrl pref via the right-click context menu to the default value to re-enable the snippets and make Firefox recreate the moz-safe-about+home folder.

Close and restart Firefox after changing the value of the browser.aboutHomeSnippets.updateUrl pref.

You can open the about:config page via the location/address bar. You can accept the warning and click "I'll be careful" to continue.

• http://kb.mozillazine.org/about:config

You can use this button to go to the currently used Firefox profile folder:

• Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
• http://kb.mozillazine.org/Profile_folder_-_Firefox