WARNING:root:python-html2text is not present. HTML pages will not be converted into text.
panda@panda-1215B-1215B:~$ firefox

(process:32434): GLib-CRITICAL **: g_slice_set_config: assertion 'sys_page_size == 0' failed
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A coding exception was thrown and uncaught in a Task.

Full message: TypeError: this.Paths is null
Full stack: Agent.write@resource:///modules/sessionstore/SessionWorker.js:196:9
worker.dispatch@resource:///modules/sessionstore/SessionWorker.js:21:24
anonymous/AbstractWorker.prototype.handleMessage@resource://gre/modules/workers/PromiseWorker.js:122:16
@resource:///modules/sessionstore/SessionWorker.js:30:41

*************************
console.error: 
  Could not write session state file 
  Message: TypeError: this.Paths is null
  Stack:
    Agent.write@resource:///modules/sessionstore/SessionWorker.js:196:9
worker.dispatch@resource:///modules/sessionstore/SessionWorker.js:21:24
anonymous/AbstractWorker.prototype.handleMessage@resource://gre/modules/workers/PromiseWorker.js:122:16
@resource:///modules/sessionstore/SessionWorker.js:30:41

  Agent.write@resource:///modules/sessionstore/SessionWorker.js:196:9
worker.dispatch@resource:///modules/sessionstore/SessionWorker.js:21:24
anonymous/AbstractWorker.prototype.handleMessage@resource://gre/modules/workers/PromiseWorker.js:122:16
@resource:///modules/sessionstore/SessionWorker.js:30:41

Vector smash protection is enabled.
WARNING: content window passed to PrivateBrowsingUtils.isWindowPrivate. Use isContentWindowPrivate instead (but only for frame scripts).
pbu_isWindowPrivate@resource://gre/modules/PrivateBrowsingUtils.jsm:25:14
nsBrowserAccess.prototype.openURI@chrome://browser/content/browser.js:15845:21