A Persona specifies the colors for text and background.

You can edit those values for the current Persona on the about:config page in the pref lightweightThemes.usedThemes in accentcolor and textcolor.

lightweightThemes.usedThemes:

[{"id":"1","name":"Persona","accentcolor":"#f8f8f8","textcolor":"#000000","description":"*****","author":"*****","headerURL":"http://getpersonas-cdn.mozilla.net/","footerURL":"http://getpersonas-cdn.mozilla.net/","previewURL":"","iconURL":"","updateURL":""}]

Greetings. Upon reading through your post here:

A Persona specifies the colors for text and background.

You can edit those values for the current Persona on the about:config page in the pref lightweightThemes.usedThemes in accentcolor and textcolor.

lightweightThemes.usedThemes:

[{"id":"1","name":"Persona","accentcolor":"#f8f8f8","textcolor":"#000000","description":"*****","author":"*****","headerURL":"http://getpersonas-cdn.mozilla.net/","footerURL":"http://getpersonas-cdn.mozilla.net/","previewURL":"","iconURL":"","updateURL":""}]

I had an issues regards of the font's color that few of the personas which I had installed; there are persona's background color making the font difficult to see(which the fonts is in its default color: black) or in some other personas that came with its own custom edit font's color that I'm not satisfied with.....

May I ask, does this method that you had given on this thread edits the font's color into any other color ?

Firefox will use the background color (accentcolor) and text color (textcolor) values as specified in the Persona only for text that is covered by that Persona (toolbars and tab bar). You see the background if the Persona is missing for some reason and probably also if the Persona has parts that are transparent (don't know about the latter). The problem is that some Personas have a wide range of colors and in such cases it can be difficult to find colors that are acceptable.

Every persona I install on this computer doesn't change the menu text color, but installing the same persona on my other computer does change the menu text color. I've disabled *all* add-ons I have and it still doesn't work. Anyone else having this problem?

Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of your add-ons is causing your problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).

See Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems