UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.146 Safari/537.36

Steps to reproduce the problem:
1. Start app.
2. Look in /tmp
$ ls -og /tmp/.org.chromium.Chromium.*|head
-rw------- 1  11362 03-20 14:27 /tmp/.org.chromium.Chromium.04h8rV
-rw------- 1  26823 03-20 14:27 /tmp/.org.chromium.Chromium.07l9C7
-rw------- 1   4545 03-20 14:25 /tmp/.org.chromium.Chromium.0rBJ5e
-rw------- 1   4517 03-20 14:26 /tmp/.org.chromium.Chromium.0rDuOH
-rw------- 1  13806 03-20 14:25 /tmp/.org.chromium.Chromium.0rQ5Zo

That's right, FIVE HUNDRED image files put directly in /tmp.

The designers perhaps thought "Oh, they are .dot files, nobody will notice them."

What is the expected behavior?
Kindly make a separate directory under /tmp to put them.

What went wrong?
500 files plopped directly in /tmp without even their own subdirectory.

WebStore page: https://chrome.google.com/webstore/detail/line/ophjlpahpchlmihnnnihgmmeilfjmjjc

Did this work before? No 

Chrome version: 65.0.3325.146  Channel: n/a
OS Version: 
Flash Version: