I'm wondering if for the bookmark toolbar, if its possible to change the text color of the words. When using a theme or persona, sometimes its hard to see the words.
What I mean is where the text is white for the items in the toolbar, if its possible to change it to a black or any other color to help see better while using a theme or persona.
Alla svar (1)
If you have installed a persona that doesn't work well for you then you need to uninstall it and revert to default theme or try to find a persona that works better.
If you have installed a persona then the default text color and background color of the toolbars are defined by that persona.
The colors of the currently selected persona are stored as the first entry in the pref lightweightThemes.usedThemes as textcolor and accentcolor.
You can edit that pref and set another value for the "textcolor":"#ffffff" part (e.g. "textcolor":"#000000").
You can change the background "accentcolor":"-moz-dialog" and "textcolor":"#000000" to make the text show better.
To open the about:config page, type about:config in the location (address) bar and press the "Enter" key, just like you type the url of a website to open a website.
If you see a warning then you can confirm that you want to access that page.