1566989 - When Firefox opens the Maps JavaScript API sample several times in the same tab, the map will not be displayed on even times

Status: RESOLVED DUPLICATE of bug 1567535

(Core :: JavaScript Engine, defect)

Description

[EarlgreyTea]

From https://forums.mozillazine.jp/viewtopic.php?f=2&t=17665

User-Agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Firefox/68.0

Steps To Reproduce:

1. Open https://developers.google.com/maps/documentation/javascript/examples/
2. Click "Styles / Styled Maps - Night Mode" link.
3. Repeat step 2.

Actual Results:
Sample map is displayed at odd clicks but not at even clicks.
(However, this issue does not occur if "Disable HTTP Cache" is set in Settings of devtools.)

Expected Results:
Sample map should be displayed with every click.

Regression window:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=a0cad7a2f14350c12ad6dba4ea1c50b2958dc442&tochange=c477a96a488995459baab0948a10cb7231d7cbe3

Comment 1

[EarlgreyTea]

Attachment: Bug1566989.mp4

Comment 2

[Hani Yacoub, Desktop QA]

Managed to reproduce this bug on Firefox Nightly 70.0a1, Firefox 69.0b6 and on Firefox 68.0.1 Windows 10 x64.

Comment 3

[André Bargull [:anba]]

Based on the regression window and that "Disable HTTP Cache" fixes the issue, it could be regression from bug 1548349. Ehsan, can you take a look? Thanks!