Nightly Firefox: ReferenceError: can't access lexical declaration `tabs' before initialization

[anaran]

ReferenceError: can't access lexical declaration `tabs' before initialization
Stack trace:
openJotTab/runScript/<@resource://gre/modules/commonjs/toolkit/loader.js -> resource://jid1-he38y6vsw9tphg-at-jetpack/lib/main.js:458:15
emit@resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/event/core.js:104:9
receive@resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/content/worker.js:74:26
emit@resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/event/core.js:104:9
emit@resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/event/core.js:104:9
emit@resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/event/core.js:115:45
processMessageReceived@resource://gre/modules/commonjs/toolkit/loader.js -> resource://gre/modules/commonjs/sdk/remote/parent.js:75:32