Add donate promo to tabzilla. Bug 943043.
Avoid non-default box-sizing styles in tabzilla
Bug 934348
Disable custom /firefox/whatsnew view for pl. Bug 936269.

- Keeping functionality & template around for future use.
[fix bug 929031] Fixes for Lightbeam page after push
Merge pull request #1483 from jpetto/bug-943043-tabzilla-donate-promo

Add donate promo to tabzilla. Bug 943043.
Merge pull request #1486 from jpetto/bug-936269-disable-custom-whatsnew-for-pl

Disable custom /firefox/whatsnew view for pl. Bug 936269.
Merge pull request #1462 from alexgibson/bug-929031-fixes-for-lightbeam-page-after-push

Bug 929031 fixes for lightbeam page after push
Merge pull request #1484 from sgarrity/bug-934348-tabzilla-box

Avoid non-default box-sizing styles in tabzilla