Specifically, it's ClassicTB2 for Epyrus.
Classic theme stopped working :( Topic is solved
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Octopuss
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Classic theme stopped working :(
Why did a minor update break a theme?
Now the program looks horrible 
Specifically, it's ClassicTB2 for Epyrus.
Specifically, it's ClassicTB2 for Epyrus.
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athenian200
- Contributing developer

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Re: Classic theme stopped working :(
I have no idea. It's probably just because I bumped the middle version number of the mail client... I vaguely remember this happening the last time I went from 2.0.x to 2.1.x. Possibly the version in there just needs to be bumped? If I'd remembered that would happen I might have just gone for 2.1.4.
But in all honesty, I don't maintain the ClassicTB2 theme myself.
But in all honesty, I don't maintain the ClassicTB2 theme myself.
"Linux makes everything difficult." -- Lyceus Anubite
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"Linux is a cancer that attaches itself in an intellectual property sense to everything it touches. That's the way that the license works." -- Steve Ballmer
"We always overestimate the change that will occur in the next two years and underestimate the change that will occur in ten." -- Bill Gates
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Bilbo47
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Re: Classic theme stopped working :(
Either this isn't the fix or I don't know how to do the hack properly. For background, I've gotten it to work on like only one extension ever, so...
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Moonchild
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Re: Classic theme stopped working :(
Check for updates in the Add-on manager of Epyrus! I've just released a theme update for it.
It should update to a compatible version, and then you need to re-enable it and issue a restart.
It should update to a compatible version, and then you need to re-enable it and issue a restart.
"Sales hates anything that can't be turned into a confident sentence." - anonymous warehouse worker
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"Seek wisdom, not knowledge. Knowledge is of the past; wisdom is of the future." -- Native American proverb
"Linux makes everything difficult." -- Lyceus Anubite
"Why debate someone you fundamentally don't trust?" - Dario Amodei
"Seek wisdom, not knowledge. Knowledge is of the past; wisdom is of the future." -- Native American proverb
"Linux makes everything difficult." -- Lyceus Anubite
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Octopuss
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Re: Classic theme stopped working :(
I must be especially stupid today but can you tell me how to do that? I don't see any check for updates button.
The theme is disabled and I can't do anything with it.
What am I supposed to do here?
edit: Nevermind, I simply removed it and went to the addons website and downloaded the .xpi again.
edit2: The theme works. Yay!
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Moonchild
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Re: Classic theme stopped working :(
For future reference.
Add-ons manager -> gear -> check for updates.
You do not have the required permissions to view the files attached to this post.
"Sales hates anything that can't be turned into a confident sentence." - anonymous warehouse worker
"Why debate someone you fundamentally don't trust?" - Dario Amodei
"Seek wisdom, not knowledge. Knowledge is of the past; wisdom is of the future." -- Native American proverb
"Linux makes everything difficult." -- Lyceus Anubite
"Why debate someone you fundamentally don't trust?" - Dario Amodei
"Seek wisdom, not knowledge. Knowledge is of the past; wisdom is of the future." -- Native American proverb
"Linux makes everything difficult." -- Lyceus Anubite
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Bilbo47
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Octopuss
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Halvar
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Re: Classic theme stopped working :(
In Epyrus 2.2.0, legacy themes no longer work (at least the ones I have installed). Updating install.rdf like this makes them compatible again.
Code: Select all
<em:targetApplication>
<!-- Epyrus -->
<Description>
<em:id>{29877c1d-27df-4421-9a79-382c31470151}</em:id>
<em:minVersion>2.0.0a1</em:minVersion>
<em:maxVersion>2.2.*</em:maxVersion>
</Description>
</em:targetApplication>
</Description>
</RDF>
Last edited by Halvar on 2026-02-07, 14:04, edited 1 time in total.
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Moonchild
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Re: Classic theme stopped working :(
I recommend you don't set maxversion to 2.* but keep it more conservative (e.g. 2.2.*)
"Sales hates anything that can't be turned into a confident sentence." - anonymous warehouse worker
"Why debate someone you fundamentally don't trust?" - Dario Amodei
"Seek wisdom, not knowledge. Knowledge is of the past; wisdom is of the future." -- Native American proverb
"Linux makes everything difficult." -- Lyceus Anubite
"Why debate someone you fundamentally don't trust?" - Dario Amodei
"Seek wisdom, not knowledge. Knowledge is of the past; wisdom is of the future." -- Native American proverb
"Linux makes everything difficult." -- Lyceus Anubite
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Halvar
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Bilbo47
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Re: Classic theme stopped working :(
Okay but what are the next steps? Please post a URL for "how to distribute XPI files for UPX"; my link is missing or stale. The docs tell the correct way to ZIP the folder into an XPI file.
Extensions that have a folder under the browser profile could I guess be updated in place? But the real way to make this change is to package it properly for others to download and install.
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Halvar
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Re: Classic theme stopped working :(
I’m not sure if there’s an Epyrus add-on that can export themes. The simplest way is to re-download the theme from here:Bilbo47 wrote: ↑2026-02-09, 21:54Okay but what are the next steps? Please post a URL for "how to distribute XPI files for UPX"; my link is missing or stale. The docs tell the correct way to ZIP the folder into an XPI file.
Extensions that have a folder under the browser profile could I guess be updated in place? But the real way to make this change is to package it properly for others to download and install.
Code: Select all
https://services.addons.thunderbird.net/en-US/thunderbird/complete-themes/Code: Select all
install.rdf-
Bilbo47
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Re: Classic theme stopped working :(
The answer I wanted is the "Command Line method" in this stack overflow answer. That gets me past the problem of 'cannot install upated xpi containing updated rdf'
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Bilbo47
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Re: Classic theme stopped working :(
Okay added the unstated part of these instructions
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emgee
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