Find a common extension that causes slow startup of firefox: flashgot

Find a common extension that causes slow startup of firefox: flashgot-general Linux technology-Linux technology and application information. The following is a detailed description. Recently, it was found that firefox was slow to start, so the terminal was started and wine was called!

What's going on? Firefox is certainly not so rogue. Remove all extensions and try again without wine. Therefore, the problem is expansion, but it is not certain which extension is at fault.
Finally, flashgot is updated today. As you know, after flashgot is updated, firefox will open the home page of flashgot.

I can see this section in the "Main good news are:" bar:
Windows visual download managers are now fully supported on Linux through Wine
(Tested with FlashGet and Orbit Downloader on Ubuntu 8.0.4). You can disable
Wine support setting the flashgot. useWine about: config preference to false.

The translation is:
Now we use wine to make linux fully support visual Download Manager in windows (flashget and orbit are tested in ubuntu8.04 ). You can switch flashgot. useWine to false in about: config to disable this function.