1308466 - CSS / opton tag / font size

Status: RESOLVED DUPLICATE of bug 910022

(Firefox :: Untriaged, defect)

Description

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Attachment: win10.png

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:49.0) Gecko/20100101 Firefox/49.0
Build ID: 20160920074044

Steps to reproduce:

I can reproduce the problem on Ubuntu 16 x64 and Windows 10 platforms too (the later is a clean install with default settings).

1) remove Firefox profile folder to start with default settings without any addons
2) open the following JSFiddle: https://jsfiddle.net/32sn0L37/1/
3) close Firefox
4) open the same more times


Actual results:

Everything works good for the first time. The text size of the select and the ones in the dropdown list are at 300%.

For the second and more time the text in the dropdown list is much smaller (probably 100% instead of the requested 300).


Expected results:

The text size in the dropdown list should be at 300% too.

Comment 1

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The profile folder I remove on Windows before the test is: C:/Users/AppData/Roaming/Mozilla

Stackoverflow thread here:
http://stackoverflow.com/questions/39916190/ff-css-select-option-font-size-how

Ubuntu screenshot:
http://i.imgur.com/pxGsqec.png

Windows screenshot:
http://i.imgur.com/jG3ISts.png

Comment 2

[mail]

Fix: I meant C:/Users/Myuser/AppData/Roaming/Mozilla

Comment 3

[Tooru Fujisawa [:arai]]

I suspect it's because of e10s (bug 910022).

Can you open about:support in step 2 and step 4 and check the value of "Multiprocess Windows" in " Application Basics" section?

Comment 4

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I have checked and Multiprocess is enabled.

BTW this is not the first bug I run into with e10 enabled FF. I find that the order of the JS events might differ and mix compared to the e10 disabled version.

Thanks.

Comment 5

[Tooru Fujisawa [:arai]]

Do you mean Multiprocess is enabled in both steps?

Comment 6

[Tooru Fujisawa [:arai]]

to be clear, I was thinking it would be disabled in step 2 and enabled in step 4, so that you see the issue only on step 4.

Comment 7

[mail]

I've done the tests above with e10 enabled in every case.

How can I disable it in the Windows version? I'd check if I can reproduce the issue with e10 disabled.

Comment 8

[Tooru Fujisawa [:arai]]

e10s is automatically disabled in some case.
so, can you check again with the steps in comment #0 again and check the value of "Multiprocess Windows" in about:support for step 2 and 4 ?

Comment 9

[mail]

Of course. You were right.

Step 2 -> good result -> e10 disabled
Step 4 -> bad result  -> e10 enabled (automatically)

Comment 10

[Tooru Fujisawa [:arai]]

Thanks, then this is a dupe of bug 910022.

Comment 11

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Thanks.