User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0 Build ID: 20180621064021 Steps to reproduce: Proceed to https://addons.mozilla.org/firefox/addon/unified-russian-english-spell/ and try to install it. Actual results: [Show/hide message details.] Text Александр Петренас is not allowed in a subject node RDFDataSource.jsm:163 ERROR resource://gre/modules/addons/RDFDataSource.jsm:163:3 _parseElement resource://gre/modules/addons/RDFDataSource.jsm:602:9 _parseElement resource://gre/modules/addons/RDFDataSource.jsm:689:13 _parseDocument resource://gre/modules/addons/RDFDataSource.jsm:1238:9 RDFDataSource resource://gre/modules/addons/RDFDataSource.jsm:1140:5 loadFromString resource://gre/modules/addons/RDFDataSource.jsm:1147:12 loadFromString resource://gre/modules/addons/RDFManifestConverter.jsm:43:21 loadManifestFromRDF resource://gre/modules/addons/XPIInstall.jsm:608:18 InterpretGeneratorResume self-hosted:1269:8 next self-hosted:1224:9 loadFromRDF resource://gre/modules/addons/XPIInstall.jsm:786:23 InterpretGeneratorResume self-hosted:1269:8 next self-hosted:1224:9 1531413315515 addons.xpi WARN Download of https://addons.mozilla.org/firefox/downloads/file/371168/addon-1.0.1-sm+tb+fx.xpi?src=dp-btn-primary failed: Error: subject nodes cannot contain text content (resource://gre/modules/addons/RDFDataSource.jsm:603:15) JS Stack trace: _parseElement@RDFDataSource.jsm:603:15 _parseElement@RDFDataSource.jsm:689:13 _parseDocument@RDFDataSource.jsm:1238:9 RDFDataSource@RDFDataSource.jsm:1140:5 loadFromString@RDFDataSource.jsm:1147:12 loadFromString@RDFManifestConverter.jsm:43:21 loadManifestFromRDF@XPIInstall.jsm:608:18 loadFromRDF@XPIInstall.jsm:786:23 addons.mozilla.org: The add-on downloaded from this site could not be installed because it appears to be corrupt. OK! Not OK!

Something must be wrong with your website because earlier today (a few hours ago) I was able to install it and now I cannot.

Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0 20180704003137 Reporter, please don't set the Priority field. It's for developer use only. This doesn't impede testing or development work; it's therefore not a blocker. https://wiki.mozilla.org/BMO/UserGuide/BugFields It installs successfully for me in Firefox 61.0.1 Locale is en-US, which appears to be the same as reporter's, based on the language of the error messages in comment 0. Browser Console output: 1531491121334 addons.xpi WARN Ignoring localized properties with no listed locales (3) 1531491121335 addons.xpi WARN Ignoring localized properties with no listed locales (5) 1531491123985 addons.xpi WARN Add-on ruspell-extended@addons.mozilla.org is missing bootstrap method install It does fail to install in beta and nightly. Regression range: https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=5382bedfa8433c4cda6fb0b8969a5008fed7a099&tochange=292cf80054b4734a0d7c84e987f68e229f2ccc24

The extension's install.rdf file contains invalid RDF data. The built-in RDF service often accepted invalid RDF (or invalid XML), but the new one (intentionally) does not.

Andreas, can you contact the author of this dictionary and/or update the compat range to end at 61?

This is the only add-on of such kind on addons.mozilla.org and the author is not available. Could anyone from Mozilla please fix the bad file and reupload the fixed addon? I guess it's a ten minutes job.

A new version has been uploaded on July 13. Can you please re-check that one?

When I set the bug to "RESOLVED" I meant that the new version of this addon was fixed.