1375582 - Developer Tools Network Preview Missing

Status: RESOLVED DUPLICATE of bug 1375063

(DevTools :: Netmonitor, defect)

Description

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User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:55.0) Gecko/20100101 Firefox/55.0
Build ID: 20170619071723

Steps to reproduce:

1. Open developer tools
2. Run any XHR request
3. Go to network tab
4. Click on XHR request
5. Preview is missing from sidebar but other tabs are shown in the sidebar


Actual results:

Preview is not displayed on the sidebar under the network tab for XHR requests.


Expected results:

The developer tools network tab normally allows for previewing a XHR request but this is missing on all XHR requests. This is a hugely important feature that I need so I can debug issues with XHR requests. This needs to be fixed soon as I can't work well without this feature, it's really one of the most important features. I can't find an alternative but this should be easy to fix since it's likely just turned off for some reason.

Comment 2

[eltonantunes]

Is this solved? Witch version?

Comment 3

[ZCR2244]

I just ran in to the same issue earlier today debugging an ajax response from Laravel 5 - waste of 3hours resulting in rolling back to build 54.
The issue appears in build 55 and up and isn't a bug. The a$$#ole managing the debug tools is merging the preview and the response tabs because "they do the same thing" which they clearly don't. Response tab shows DOM elements as plane text where as preview tab shows the rendered DOM. 

see:
    -https://bugzilla.mozilla.org/show_bug.cgi?id=1247392 (ignored bug report with same issue)
    -https://www.reddit.com/r/firefox/comments/6h7n50/why_was_http_response_preview_removed_from/(complaints from devs needing    the preview feature)
    -https://hacks.mozilla.org/2017/06/network-monitor-reloaded/#comment-21296(over view of the new debug tools and someone pointing out the preview issue) 

for more info.

Someone please fix this issue already!