See also Conflicting Add-ons.

• Right-to-left Languages in Gmail
  • Having your Gmail set to a right-to left language such as Hebrew drastically changes the way the entire Gmail window is laid out, not to mention the logic behind the add-on's script. As such, I regret that the add-on will not work unless you change your Gmail to a left-to-right language such as English. I am sorry for the inconvenience, but I simply do not have the time or resources to fix this.
    
• Multiple Gmail tabs
  • It seems like the add-on stops working if you open Gmail in multiple tabs. I know exactly what's happening with the script, but it's very hard to fix. In the mean time, the add-on should start working again if you close all Gmail windows and tabs and open a single new one.
    
• Signature tools not drawn second reply/forward on thread
  • If you reply to or forward a message in an email conversation thread, it will work the first time, but if you then try to reply to a different message within the thread without leaving the page, the signature tools will not be drawn. I am working on a listener to detect the disappearance of the from address selector in order to trigger the function that listens for the clicking of a new compose window.

• Signature is not saved in memory on U3 Portable Firefox
  • Signatures work fine but are not saved between sessions.
    
• Simple text not supported
  • This extension was originally designed for the use of full HTML signatures. Support for plain text signatures has not yet been added, but is planned, with no release date available.
    

Suspected Bugs

Below are some bugs that I believe are a problem. Please let me know what your experiences are.

• 
  
• Google Apps
  • I am virtually certain that this extension does not yet support Google Apps. Support for this is planned, but no release date is available as of yet. Many people have reported that this is working, but I believe that I will need to add an option for custom domains.