As per comment #0 we have tested this issue on reported chrome version 69.0.3464.0 using Windows 10. Attaching screen-cast for reference.
Steps:
--------
1. Launched chrome
2. Downloaded the Google translate extension and added to chrome browser.
3. Changed Extension options primary language to English
3. Navigated to Wikipedia and copied some text and pasted it on google translate.
As we have seen extension displays correctly.

@Reporter: As we are unable to reproduce the issue from our end. Can you verify this issue with fresh profile that is not having any extensions and apps or reset all the flags. Let us know whether issue still persists..

Thanks.!

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My dear @Confirmer, why the hell you ignore everything I said.

1. I said This bug only in certain text.
2. I said any text makes extension body width = 437 & height = 579
3. I gave you a demo to reproduce the bug in the comment above and you chose to go to the Wikipedia and try to select a random text, do you think this actually will let you to reproduce this bug.


Please Note Again:
This time don't go to Wikipedia and try with a random text.
This a new demo to reproduce the bug, try it and don't ignore it like last time.

New Demo.
 ↓
 ↓
 ↓

My dear Why. Just tell me why you ignore everything I said, why? and why you chose the wrong way and left everything behind why? it was unclear, fuzzy or you have a cat allergy what? Just kidding, don't take it seriously. I hope the best for you. and although it saddens me to say that, but I hope you can reproduce this bug this time. Don't forget this time, try to highlight this particular text. And let the fix be with you, Amen.

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Thank you for providing more feedback. Adding the requester to the cc list.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Able to reproduce the issue on Windows 10, mac 10.13.3 and Ubuntu 17.10 using chrome reported version #69.0.3464.0 and latest canary #69.0.3487.0.

Bisect Information:
=====================
Good build: 66.0.3344.0
Bad Build : 66.0.3345.0

Change Log URL: 
https://chromium.googlesource.com/chromium/src/+log/43e31b80075135d513ff10a19e8293aca21a0ed0..004f3b4b4000be325307d1c409a03411aa00beaa

From the above change log suspecting below change
Change-Id: If00ef5f841ffaf826c9e31c98ed5c3bd82c41bed
Reviewed-on: https://chromium-review.googlesource.com/910125

xiaochengh@ - Could you please check whether this is caused with respect to your change, if not please help us in assigning it to the right owner.

Thanks...!!

CL 910125 is part of the LayoutNG project, which is still behind a flag and shouldn't affect any default behavior.