[Note] This is a follow-up bug for Bug 1215025 [Affected versions]: Firefox 52.0a1 (2016-10-10) Firefox 51.0a2 (2016-10-10) Firefox 50.0b5 (20161005190701) Firefox 49.0.2 (20160924030724) [Affected platforms]: Windows 10 64-bit Windows 7 64-bit Ubuntu 14.04 64-bit [Steps to reproduce]: 1.Launch Firefox with clean profile. 2.Create the xpinstall.signatures.dev-root pref in about:config and set it to true. 3.Install the following webextension: https://addons-dev.allizom.org/en-US/firefox/addon/quick-vat-calculator-ica-test/ 4.Click on the webextension icon from toolbar. [Expected Results]: The webextension panel is auto-resized according to content size. [Actual Results]: Unnecessary scrollbars appear in webextension panel. [Additional notes]: - I am attaching a screenshot. - Kris mentioned in https://bugzilla.mozilla.org/show_bug.cgi?id=1215025#c42 about this bug that: This is happening because of the margin of the <div> inside the body and, as far as I can tell, the effect of CSS margin collapsing on size calculation. This is technically probably a bug in the layout code, but it's also probably worth fixing.

Mass wontfix for bugs affecting firefox 52.

(In reply to Julien Cristau [:jcristau] from comment #1) > Mass wontfix for bugs affecting firefox 52. AFAIU, it does affects Firefox 59 as well.

Or at least 57: https://github.com/gorhill/uMatrix/issues/919 I have a different issue here, so…