try see here Userstyle

@Nellus91 No, it just came up with the same as it did before I installed the plugin.

Sorry also try Super Start

@Nellus91 It's not showing my browser theme. I went to the add-on setting (prefences) and change it to transparent, still not my browser theme. :(. Might have to say Bye-bye Firefox.

When you say "speed dial" do you mean the built-in new tab page with the 9 thumbnails?

Since you have the Stylish extension, try this:

Select the following style rule and copy it:

@namespace url(http://www.w3.org/1999/xhtml);
@-moz-document url("about:newtab") {
    #newtab-scrollbox {
        background-color:transparent !important;
        background-image:none !important;
    }
}

Display the new tab page

Click the Stylish menu button ("S" icon) and choose Write New Rule > Blank Style

Paste into the larger box with the initial line number 1 on the left

Click the Preview button

If it works, name it and save it. You're done.