'mdblogger' is a free Chrome extension developed by opdev1004. It is a markdown editor specifically designed for Google Blogger. By inserting a markdown editor into the Blogger post edit page, this extension allows writers to focus on their writing without having to worry about styling.

One important thing to note is that after completing the writing, you need to edit the Blogger's editor once before finishing your post. This can be done by adding and removing a space or switching from compose view to HTML view. This step is necessary because the content will not be saved, updated, or published until the Blogger editor updates the hidden post data.

To add images, you can press 'Ctrl' and 'q' to copy the content from the Blogger editor (left side) to the markdown editor (right side). This shortcut can also be used for adding images. However, the markdown editor also has its own image uploading system, which will store the image data within the post. It's important to note that using this system may make the post appear slightly messy. For videos, you will need to use the Blogger editor, as the markdown editor does not support videos and may convert them into single images.

'mdblogger' is an open-source extension licensed under the MIT license, allowing for both commercial and non-commercial use. However, it is worth mentioning that if you have a custom theme, it may cause some problems as it can affect the styling of the edit page. In cases where the extension is not working, a simple refresh (F5) of the edit page may resolve the issue. It's also important to back up your unsaved data, as the extension does not provide a backup feature.