Some more information (I hope this is helpful):
The 'pink' status bar is reporting that there is a problem - the Details window gives the following information:
There is a problem with Gmail's integration of FireGPG.
Please check the status page and/or report the following errors:
checkDock/message chrome://firegpg/content/Webmails/Gmail/cgmail2.js 594 boutonboxs[j].getAttribute("class") is null
checkDock/message chrome://firegpg/content/Webmails/Gmail/cgmail2.js 594 boutonboxs[j].getAttribute("class") is null
checkDock/message chrome://firegpg/content/Webmails/Gmail/cgmail2.js 594 boutonboxs[j].getAttribute("class") is null
checkDock/message chrome://firegpg/content/Webmails/Gmail/cgmail2.js 594 boutonboxs[j].getAttribute("class") is null
checkDock/message chrome://firegpg/content/Webmails/Gmail/cgmail2.js 594 boutonboxs[j].getAttribute("class") is null
checkDock/message chrome://firegpg/content/Webmails/Gmail/cgmail2.js 594 boutonboxs[j].getAttribute("class") is null
checkDock/message chrome://firegpg/content/Webmails/Gmail/cgmail2.js 594 boutonboxs[j].getAttribute("class") is null
checkDock/message chrome://firegpg/content/Webmails/Gmail/cgmail2.js 594 boutonboxs[j].getAttribute("class") is null
checkDock/message chrome://firegpg/content/Webmails/Gmail/cgmail2.js 594 boutonboxs[j].getAttribute("class") is null