It's rather insignificant. But I was just wondering if this was an issue other people experience and if it's fixable. I've created a custom theme using Firefox color and am currently using it. After shutting down my MacBook and then opening Firefox (the next day typically), it would display a previous (not custom) theme for about 5 seconds before suddenly changing to my custom one. Similarly, I have downloaded the extension, 'Infinity New Tab' and customized it a lot. For some reason, when simply opening a new window in Firefox, it displays the standard, default new tab appearance. Only when I open a new tab in that window, 'Infinity New Tab' is displayed. In the home section of preferences it says that the extension is indeed controlling my new tab page. If this is out of your control then I apologize. I would appreciate any assistance or information. Thanks.