Element Hiding Helper (EHH) doesn't work with Electrolysis (e10s)

[Gingerbread Man]

Environment

Firefox 35.0a1 (2014-09-12) • Adblock Plus 2.6.4.3862 • Element Hiding Helper 1.3.0.470

How to reproduce

1. In case you didn't agree to enable e10s when prompted, click the ≡ Menu Button and choose New e10s Window.
2. Go to any site.
3. Click the Adblock Plus button.
4. Right-click any element on the page and choose Inspect Element.
5. Select an element in the HTML code view, then click the Adblock Plus icon on the inspector toolbar.

Observed behavior

• The "Select an element to hide" menu item is grayed out. Clicking it does nothing.
• Pressing Ctrl+Shift+F3 does nothing.
• The "Compose element hiding rule" window shows a blank text box with no suggested filter.

Expected behavior

• The "Select an element to hide" menu item should work.
• Pressing Ctrl+Shift+F3 should work.
• The "Compose element hiding rule" window should show an appropriate filter for the element selected in the inspector pane.

Also see

• https://issues.adblockplus.org/ticket/1091
• https://issues.adblockplus.org/ticket/1256
• ​https://adblockplus.org/forum/viewtopic.php?f=1&t=24988

[zamber]

Confirming on Firefox Developer Edition 40.0a2 (2015-05-19) using Aurora update channel.

[philll]

Made Firefox and Firefox mobile available as seperate platforms.

[trev]

AFACT the main issues have been resolved, some in Firefox, some by us in #2816.