RangeError: invalid language tag: "\"en-US"

[inainaina00]

Username

majestyindeath

What happened?

Error occurs on every page when trying to load lastfm on Firefox browser. Reinstalling script on firefox, using either tampermonkey or violentmonkey, does not appear to solve the issue. But script did load correctly when using a different browser (Opera GX)

RangeError: invalid language tag: "\"en-US"
getCachedIntResolvedOptions@moz-extension://97d31897-c4af-4d3d-8387-d7c19ce701b9/userscripts/bleh.user.js?id=ca5b5914-ec90-4f0c-b15a-2a3d3d9545dd:21825:14
isEnglish@moz-extension://97d31897-c4af-4d3d-8387-d7c19ce701b9/userscripts/bleh.user.js?id=ca5b5914-ec90-4f0c-b15a-2a3d3d9545dd:22165:79
relFormatter@moz-extension://97d31897-c4af-4d3d-8387-d7c19ce701b9/userscripts/bleh.user.js?id=ca5b5914-ec90-4f0c-b15a-2a3d3d9545dd:22159:51
format@moz-extension://97d31897-c4af-4d3d-8387-d7c19ce701b9/userscripts/bleh.user.js?id=ca5b5914-ec90-4f0c-b15a-2a3d3d9545dd:26016:46
diffRelative@moz-extension://97d31897-c4af-4d3d-8387-d7c19ce701b9/userscripts/bleh.user.js?id=ca5b5914-ec90-4f0c-b15a-2a3d3d9545dd:26033:16
toRelative@moz-extension://97d31897-c4af-4d3d-8387-d7c19ce701b9/userscripts/bleh.user.js?id=ca5b5914-ec90-4f0c-b15a-2a3d3d9545dd:27503:14
update_masthead@moz-extension://97d31897-c4af-4d3d-8387-d7c19ce701b9/userscripts/bleh.user.js?id=ca5b5914-ec90-4f0c-b15a-2a3d3d9545dd:49247:11
update_check@moz-extension://97d31897-c4af-4d3d-8387-d7c19ce701b9/userscripts/bleh.user.js?id=ca5b5914-ec90-4f0c-b15a-2a3d3d9545dd:48332:19
on_body_load@moz-extension://97d31897-c4af-4d3d-8387-d7c19ce701b9/userscripts/bleh.user.js?id=ca5b5914-ec90-4f0c-b15a-2a3d3d9545dd:59401:21
main2@moz-extension://97d31897-c4af-4d3d-8387-d7c19ce701b9/userscripts/bleh.user.js?id=ca5b5914-ec90-4f0c-b15a-2a3d3d9545dd:48567:27
window["__f__mm41cewn.6fb"]/</florence/pre_observer<@moz-extension://97d31897-c4af-4d3d-8387-d7c19ce701b9/userscripts/bleh.user.js?id=ca5b5914-ec90-4f0c-b15a-2a3d3d9545dd:48546:9

on: /
    /user/majestyindeath
    2026.0212

bleh

2026.0212

Browser

Firefox

Last.fm Pro

• Yes
• No

Language (selected in bleh)

English

Extension

Violentmonkey

[katelyynn]

im able to recreate this bug but only if i force a weird locale, maybe its a browser issue coming from firefox? (even though i use firefox too)

it might be down to what your system is reporting to firefox, maybe your version is out of date or something im not really sure as thats a very strange bug (especially the broken quotation mark)

[katelyynn]

should be fixed in the next release hopefully