Modify the icon on browser tab (favicon)

What is the problem?
I'm currently modifying the sources of octoprint and I want to change the icon that is displayed on the browser tab.

What did you already try to solve it?
Searched a lot on internet but couldn't find a solution

Sorry for not just answering your question, but the smarter thing to do is write one or more plugins. If you directly change the sources of OctoPrint, you will have to do that again when you want to upgrade to a newer version of OctoPrint when it is released (or be stuck with your old version).

You are talking about the favicon.ico. I looked through the OctoPrint source, and this is added in a unique way in Octoprint. See /src/octoprint/server/init.py on or around line 1653. You'll see that /favicon.ico is set to tentacle-20x20.png. There is javascript in /scr/octoprint/static/js/viewmodels/appearance.js on or around line 19 that performs a substitution within the themeFavicon function.

Yeah, looking at the output code it seems you would just need to replace the following pieces with your own changes...

        <link rel="shortcut icon" href="data:image/png;base64,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" type="image/x-icon">
        <link rel="mask-icon" href="/static/img/mask.svg" color="#56BE37">
        <link rel="mask-icon-theme" href="/static/img/mask-theme.svg" color="#56BE37">
        <link rel="apple-touch-icon" sizes="114x114" href="/static/img/apple-touch-icon-114x114.png">
        <link rel="apple-touch-icon" sizes="144x144" href="/static/img/apple-touch-icon-144x144.png">

The interesting part is the base64 encoded png image file. So a jquery call like this in an asset plugin mixin with a single js file should do the trick. Just change the icon tag that is getting appended...

$('head > link[rel="mask-icon-theme"][rel="mask-icon"][rel="apple-touch-icon"][rel="shortcut icon"]').remove();
$('head').append('<link rel="icon" type="image/png" href="https://en.wikipedia.org/static/apple-touch/wikipedia.png">');
1 Like

This guy favicons! Nice clean non-source altering solution!