Bugzilla

**Affected versions**
*60.9esr, 68.1.0esr, 69.0.1, 70.0b8, 71.0a1 (2019-09-22) ;

**Affected platforms**
* Windows 10, macOS 10.14;

**Steps to reproduce**
* Check the *Enable browser chrome and add-on debugging toolboxes*;
1. Launch Firefox, enable the DevTools inspector; 
2. Access any internal about: page (*ex: about:about or about:config)
3. Open a new tab and access any webpage in it;
4. Enable the Browser Toolbox;
5. Access the Network tab;
6. Click inside the empty Network tab to trigger the page reload;

**Expected result**
* page reloads properly, Network tab is aggregated with information;

**Actual result**
* page goes blank, back/forward buttons are disabled;

**Regression range**
* regression range might be invalid since with builds prior to the one considered "good" the Refresh button had no effect;
* First bad: changeset: 43fb1f92e8d4 build_date: 2015-03-07
* Last good: changeset: 0189941a3fd5 build_date: 2015-03-06
* Pushlog [URL](https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=0189941a3fd5&tochange=fecf1afb0830)

**Additional notes**
* attached recording with the issue;
* issue does not reproduce for browser console;
* marked the issue with minor priority since it's somewhat of an edge case scenario.

**Affected versions**
*60.9esr, 68.1.0esr, 69.0.1, 70.0b8, 71.0a1 (2019-09-22) ;

**Affected platforms**
* Windows 10, macOS 10.14;

**Steps to reproduce**
* Enable: *Enable browser chrome and add-on debugging toolboxes*, *Enable remote debugging*;
1. Launch Firefox, enable the DevTools inspector; 
2. Access any internal about: page (*ex: about:about or about:config)
3. Open a new tab and access any webpage in it;
4. Enable the Browser Toolbox;
5. Access the Network tab;
6. Click inside the empty Network tab to trigger the page reload;

**Expected result**
* page reloads properly, Network tab is aggregated with information;

**Actual result**
* page goes blank, back/forward buttons are disabled;

**Regression range**
* regression range might be invalid since with builds prior to the one considered "good" the Refresh button had no effect;
* First bad: changeset: 43fb1f92e8d4 build_date: 2015-03-07
* Last good: changeset: 0189941a3fd5 build_date: 2015-03-06
* Pushlog [URL](https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=0189941a3fd5&tochange=fecf1afb0830)

**Additional notes**
* attached recording with the issue;
* issue does not reproduce for browser console;
* marked the issue with minor priority since it's somewhat of an edge case scenario.