Using Firefox 57, the extension options says "Because of the new extension system on Firefox, most of the functionality of the Theme Font & Size Changer is not available any more"...
...so why is it even available for Firefox 57 if it's not doing anything at all (definitely no changes of fonts & sizes)??

It doesn't work anymore. You can't change the font size. You can't even change the color.

the best

IWhy, oh, why do programmers insist on writing programs with such small fonts that those with poor eyesight, even when wearing glasses, CANNOT read their programs. Furthermore, these programmers, who probably use 56 inch screens, don't incorporate a way of increasing the font size.

The theme and font changer worked exceptionally well for me - but now, the lastest invention from Mozilla Firefox has left me unable to read the Firefox menu - so how can I use it.

I am now going to immediately look for a different browser where I can read the menu and hopefully will allow me to use the Theme and Font Changer add-on as I have found it an invaluable addition over the years.

Semmire sem használható!

My previous review was deleted by somebody. I am posting it again. Version 62 does not work, you have to revert to Version 56 and stop the damn thing from updating by going to addon, and "more" and select auto update to "OFF". This is a very useful addon which I am sure helps a lot of people. Doing an update to version 62 which does not work is a useless thing to do. Deleting comments is basically dishonest.

Garbage! Absolutely GARBAGE!

Forcing an update to a no functioning extension.

Guess what, FF isn't supporting extensions anymore, so here's an update that breaks my extension on purpose. Oh and take this survey where you have to leave your email address so I can spam you.

v62 is no good , back in v56 and work fine

DOWNLOADED AND INSTALLED. CLICKED THE ICON AND READ THIS:
"Because of the new extension system on Firefox, most of the functionality of the Theme Font & Size Changer is not available any more"
WHY IS THIS AVAILABLE AS A DOWNLOAD IF IT'S NOT AVAILABLE ANY MORE? I'M USING THE LATEST FIREFOX.

cant live without this! love to see the items on the browser bars!

I COULD SEE THE WORDS

j'adore cette extension à cause de ma vue ; mais en ce moment , elle ne fonctionne plus ; pour moi c'est embêtant

I need this app and yet FF has made it so it can't be used. Mozilla needs to change its course. The full themes were incredible, the main reason why I used FF. This is a FANTASTIC app.

This was the only way I was able to use Firefox comfortably. Firefox 57 ended all that. The reason I used FF was because it's customization. I understand what FF is trying to do, but it has turned it into Chrome or Edge...UGH! So I reverted to version 56. I thought TF&SC would then, but no luck. Is there a way to make it work for older versions of FF?

Loved this until 57 was released.

But here's a question.

If you look at the page for T&FSC, it says it was updated on November 16.

Yet it still doesn't work with 57 which was released 2 days BEFORE.

What gives?

Please make available for Firefox 57. I know it's not your fault that this extension doesn't work anymore and that Mozilla's latest Firefox makes it incompatible. I've been using this Add on for many years and, like a lot of other folks with aging eyesights badly need it. Shame on Mozilla for not only making you incompatible but for also giving the middle finger to us older users by making their menu items unreadably small.

Great extension, I hope it not drop. If someone will help, there is a small means of partial replacement to this addon.
1. Place/Create/Add next file "userChrome.css" into "chrome" subfolder in your profile, e.g. C:\Users\usename\Appdata\Roaming\Mozilla\Firefox\Profiles\cdar87xx.default\chrome;
2. Fill userChrome.css next content, for example:
* {font-size: 10pt !important; font-family: "Roboto" !important;}
3. It means that you have this font already installed. You can set your own font-size and font-family values, ofcourse;
4. Restart FF.
Now it looks closely than I has with TFSC.

Can not change the font size.