author wants to install missing tools/add-ons but doesn't specify what. can't even use add-on without jumping through too many hoops.

how do i uninstall this?

I have used Theme and Font changer for years with Thunderbird and with all the updates Thuderbird fonts have gone extremely small as all are saying. Theme and font changer fixes this, but it wont save changes in my windows 7

Doesnt work...people like me who are getting older and eyes needing glasses...it seems you didnt take account of us when the 56 theme and font was great and now that wont even work. Firefox for every update makes your browser worse. Get some common sense and do it right.

What's always going on with these Baris Derin addons ?
Suddenly TFSC no longer works on TB

What's the latest version working on TB 52.5.2 ?
Where can I find old versions of Addons ?

It's a pity things are being messed up so frequently (partly initiated by Mozilla and it's Web-Extentions hype)

This is a great ad-on, when it is not being updated. It suddenly disappears from the toolbar menu, and all settings with it. So you have to go search for an update.

THIS time (Jan 8, 2018) it seems it's broken, and cannot be fixed.

Shoddy programming, really.

Unfortunately the mediafire version only worked for a day for me. I found the following on Mozilla support though and it worked fine for me:
(1) In a new tab, type or paste about:config in the address bar and press Enter. Click the button accepting the risk.

(2) In the filter box, type or paste pix and pause while the list is filtered

(3) Double-click layout.css.devPixelsPerPx and change its value to 1.25 and click OK, which corresponds to 125% font size in Windows display settings. The toolbar area should enlarge after a few moments. Too small? Try 1.5 and see whether that suits you better. And so on. If you are on Mac and use a Retina display, anything below 2.0 may be smaller than what you started with, so start with 2.0.

@Hackodis
I previously rated it at 5 stars; wish I could give it negative now.
Mozilla ought to pull this.
57 does not work with FF 57.
56 no longer works with FF 56.
Maybe a class action lawsuit by us folks with bad eyesight ...

Anyone with a way to make the add on work in a Mac OS (10.11)? Everything posted here and elsewhere is Windows.

Main thing I need is the bold.

I'd gladly pay for an app or utility that does what 56 did - or pay Boris ...

It won't install for Thunderbird and there is where I need it.

Anonymous user cf029c - What version of Firefox are you using? I'm using 56.0. Your method doesn't work.

Whatever you changed, it's still not working. No Icon can be found on Firefox nor Thunderbird to launch the App.

It just stopped working for firefox and thunderbird yesterday (Fri, Jan5). The text in the view is so smaller I cannot read it, especially in Thunderbird

Not enjoying it one bit today! All of us have spent hours trying to fix this font issue .... I'm not a programmer and not comfortable with the work-around offered. Thunderbird--big fix for all, please!!

I am using this addon in thunderbird too and there is a fix available and it works but only for thunderbird where I applied it without problem. Please see:
https://addons.mozilla.org/en-US/firefox/addon/theme-font-size-changer-for-tb/reviews/
It is not possible to install adjusted addon back to the firefox maybe due to signing addons which is required by firefox.

But there is another important aspect: the creator of this addon implemented time check into source code which was needed to remove
to ensure proper function in Thunderbird. Please see details in forum link I posted above.
Many thanks mrx2020, HackerKitty, P. Maigron for spotting this. And of course the same "time check" is in source code for firefox too. I do not judge anybody just inform abou the issue which prevents me from using firefox and thunderbird properly.

Edit: posible workaround for firefox thanks Eckard :
http://forums.mozillazine.org/viewtopic.php?f=38&t=3035148
my userChrome.css:
@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
@namespace html url("http://www.w3.org/1999/xhtml");
@namespace svg url("http://www.w3.org/2000/svg");
* {
font-size: 14px!important;
font-family:Comic Sans MS !important;
}

Baris, I am on the latest version of Firefox, using your latest version of this add-on...yet I have the problem too. It isn't functioning for me at all, so something is definitely wrong, here.

I set firefox and addons to not update past 56.1 but now Theme Font & Size Changer is not working on any of my computers.

Oh, come on. What now? Please do fix this! Old versions no longer work...

What happened with this add on, today? On every pc in my family, 7 computers total, TFSC stopped working. No updates were installed. Automatic updates are turned off. Every computer hast FF ESR 52.5.3 64 bit installed.

Did everyone get a "deactivate" signal from an external source??? Am I the only one with this theory?

So this guy Berin or Gerin wants access to all data for every website I visit in exchange for the use of this add-on? This guy has lost his mind. I'd rather buy it (one time) with no access to him for anything.

it did work fine until today..... suddenly i can´t access it anymore and everything is small again.
deinstalled and reinstalled the addon but it does not appear in thunderbird 52.5.2.


don´t know if mozilla messed around again... can only say i is not working anymore. hope it will be fixed soon.
i thought the web extension stuff ony affects firefox 57??

Why the Version 56 even on Firefox 56.02 stop working !! why you do that ???? the add_on working great until this afternoon !

CAN YOU PLEASE FIX IT !

Ich finde das add-on Spitze auf Thunderbird. Aber leider scheint es auf meinen Firefox ESR 52.5.3 nicht zu funktionieren? Schade. Warum ist dies so?

this sucks - there is no where to change the size of the text anywhere - so damn frustrating.....FUCK!!!

I just updated Firefox and I can't change my Theme back to what I had it on.... It's says 'disabled' and when I try to enable it, nothing happens at all... How can I fix this??