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First, the AutoFill button may not be enabled. To enable AutoFill for the Toolbar for Firefox, please follow these steps:
Click the Settings button on the right side of your Google Toolbar.
Select Options from the drop-down menu. The Options dialog box appears.
Check the box next to AutoFill.
Click OK to save your changes.
The AutoFill button is now enabled in your Toolbar.
Second, your Toolbar may not have enough space to show all of its buttons. If this is the case, you'll see a chevron (">>") drop-down button at the far right side of your Toolbar. You can resolve this issue by modifying the labels on your Toolbar buttons or by moving your Toolbar down to its own line. To modify your Toolbar button labels, follow these steps:
Click the Settings button on the right side of your Google Toolbar.
Select Options from the drop-down menu. The Options dialog box appears.
Click the More tab.
Under Button text labels, choose Selective text only or No icons.
Click OK to save your changes.