Firefox 29 introduces the new Australis user interface, with the aim of drastically simplifying the browser "chrome" (the menus, toolbars and navigation bar). Some work is needed for extensions that add a toolbar button to the browser -- which means that all extensions from AE Creations are impacted.
Here is a summary of the status on compatibility with the new Australis UI that was rolled out with the release of Firefox 29.
Version 4.1 of Clippings included compatibility with the Australis UI, among a few other things. I've already received a complaint that it doesn't work with the Classic Theme Restorer extension, which restores the old look of Firefox. I've added an enhancement ticket to track this request (issue #12 in the Clippings repository on GitHub), but making Clippings compatible with Classic Theme Restorer is not a priority at this time.
Work is in progress; a beta release was launched a few days ago. This is a good opportunity to address some long-standing issues: specifically, outdated toolbar button icons and lack of customization of the shortcut key. The current version of Panic Button is still usable; however, the toolbar button icon will have a fuzzy appearance if placed on the menu panel in Firefox 29, because a 32×32 pixel size of the built-in icons do not currently exist.
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Work has not yet started, but is planned. As is the case with Panic Button, it is still usable with the new Australis UI, but again the icon's appearance when the toolbar button is placed in Firefox's menu panel is an issue for the same reason. This is a good opportunity to fix a bug and to officially turn on support for Google Apps, since functionality with it is now confirmed.
Same situation with the appearance of the extension toolbar button icon in Firefox's menu panel. But because there are no other enhancements being planned for this extension, and since this is the extension with the least number of active users, I'm not prepared to invest much time into it.