959183 - Inspector takes a long time to display context menu of 200 siblings

Status: RESOLVED WORKSFORME

(DevTools :: Inspector, defect)

Description

[Stuart Orford]

Attachment: Test document with a large table

When using the DOM inspector on an element with a large number of siblings (e.g. 200), right-clicking on the element in the breadcrumb takes a long time to open the siblings menu. It is giving me the "Unresponsive script error" on chrome://global/content/bindings/text.xml:31 - clicking "Continue" on that error eventually opens the menu.

Found on ESPNcricinfo's stats pages, e.g. http://stats.espncricinfo.com/ci/engine/stats/index.html?class=1;filter=advanced;orderby=runs;qualmin1=500;qualval1=runs;size=200;template=results;type=batting

Steps to reproduce:

1. Open page with a large number of sibling elements
2. Open DOM Inspector (Ctrl-Shift-I)
3. Navigate to an element that has many siblings (e.g. a table row in a large table)
4. In the breadcrumb, right-click on the selected element

Expected behaviour:

The context menu should open in a few seconds at most.

Actual behaviour:

The context menu opens after about 30 seconds, and only after throwing an unresponsive script error.

Tested on Firefox 26.0 and Nightly 29.0a1

Comment 1

[Paul Silaghi, QA [:pauly]]

(In reply to Stuart Orford from comment #0)
> The context menu opens after about 30 seconds, and only after throwing an
> unresponsive script error.
Works fine for me on 29.0a1 (2014-01-20), win 7 x64.

Please check if the issue occurs using Firefox in safe mode (with your addons disabled):
http://support.mozilla.com/kb/Safe+Mode

Or on a new, empty profile:
http://support.mozilla.org/en-US/kb/Managing-profiles#w_starting-the-profile-manager

Comment 2

[Stuart Orford]

Yes, the problem still occurs in safe mode, and with a new blank profile. Tested on Nightly 30.0a1 (2013-02-05).

Comment 3

[Stuart Orford]

This is no longer an issue for me on Firefox 38.0 - in the original example the context menu now opens in 10-15 seconds, which is not lightning fast, but I no longer get a script timeout error.