[Bug] Firefox Won't Allow DarkReader AddOn Installation

[senorwillburr]

Prerequisites

• I searched for any existing report about this bug to avoid opening a duplicate.
• I can reproduce this bug in a new, unmodified web browser profile with Dark Reader installed as the only extension.
• I understand I need to use the Broken Website Report template if this bug I am reporting occurs on a single website.

Bug Description

While trying to install the DarkReader AddOn for Firefox, from the page: "https://addons.mozilla.org/en-US/firefox/addon/darkreader/" I get the error message: "Installation aborted because the add-on appears to be corrupt." (See Attached Screenshot)
Please dig into this issue & let me know when it's fixed, or if there's something you need from me to troubleshoot it.

Website Address

https://addons.mozilla.org/en-US/firefox/addon/darkreader/

Steps To Reproduce

1. Go to "https://addons.mozilla.org/en-US/firefox/addon/darkreader/".
2. Click "Add to Firefox" blue button.

Expected Behavior

Should install flawlessly in Firefox & be able to be enabled.

Actual Behavior

Error message: "Installation aborted because the add-on appears to be corrupt." (See Attached Screenshot)

Screenshots

See attached.

Operating System

Win 11

Web Browser name and version

Firefox 115.0

Dark Reader version

na

Additional Context

No response

[alexanderby]

Have you tried with a newer Firefox version?

[senorwillburr]

Have you tried with a newer Firefox version?

alesanderby, More detail: Firefox is running inside of FlashPeak SlimBrowser & v115.0 the last update they did. If I run Firefox directly, this is not an issue. SlimBrowser's support site states to follow up with Firefox.
Is there a way to force an add on theme? Is there a way to force an update to the latest Firefox version inside SlimBrowser's settings?