"Could not write session state file " Error: TypeError: invalid 'in' operand exn
Stack trace:
postMessage@resource://gre/modules/PromiseWorker.jsm:324:1
TaskImpl_run@resource://gre/modules/Task.jsm:315:40
Handler.prototype.process@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:870:21
this.PromiseWalker.walkerLoop@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:746:7
this.PromiseWalker.scheduleWalkerLoop/<@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:688:37
openModalWindow@resource://gre/components/nsPrompter.js:370:5
ModalPrompter.prototype.openPrompt@resource://gre/components/nsPrompter.js:553:9
ModalPrompter.prototype.confirmEx@resource://gre/components/nsPrompter.js:697:9
@chrome://browser/content/content.js:96:5
 "postMessage@resource://gre/modules/PromiseWorker.jsm:324:1
TaskImpl_run@resource://gre/modules/Task.jsm:315:40
Handler.prototype.process@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:870:21
this.PromiseWalker.walkerLoop@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:746:7
this.PromiseWalker.scheduleWalkerLoop/<@resource://gre/modules/Promise.jsm -> resource://gre/modules/Promise-backend.js:688:37
openModalWindow@resource://gre/components/nsPrompter.js:370:5
ModalPrompter.prototype.openPrompt@resource://gre/components/nsPrompter.js:553:9
ModalPrompter.prototype.confirmEx@resource://gre/components/nsPrompter.js:697:9
@chrome://browser/content/content.js:96:5
" SessionFile.jsm:314