tumblr video downloader and enhancer

Description

Chrome extension for tumblr, add right-click menu to download tumblr video in dashboard, profile, explore and so on.
add download button to video player; add volume slider; preview supported; add right-click menu to download tumblr videos.

## v 0.2.4
reverse scroll direction of video progress bar.
scroll down to fast-forward.
scroll up to rewind.

## v 0.2.3
fix a issue that some user don't have right-click menu.

## v 0.2.2
+ progress bar scrolling control.
+ Mozilla Firefox extension compatible, rewrite resume downloading algorithm (unfortunately FF doesn't support resume downloading after network restored)


Features:
1. Right-click to download Tumblr video you wish to.
2. Auto retry when it interrupted due to terrible network condition.
3. Add download button in native video player, one-click to download.
4. Add Volume Controller in native video player, scroll up volume supported.
5. Auto remember last volume.
6. Support Video Preview.
7. Works in *.tumblr.com, dashboard, profile pages, explore/video, you name it.
8. Only support native Tumblr video. Instagram, youtube and vimeo videos are not supported.
9. Not compatible with other extensions such as "Better Tumblr Video", which would modify default tumblr players

Chrome上的Tumblr视频下载扩展，提供右键菜单下载tumblr视频,支持dashboard、个人主页、发现页等各种页面。
给视频增加下载按钮、音量控制，支持视频预览，在右键菜单添加“下载Tumblr视频”菜单。
功能：
1. 右键下载你想要下载的Tumblr视频。
2. 网络状况糟糕导致下载中断时，自动重试。
3. 在原生播放器添加下载按钮，一键下载。
4. 增加音量控制。
5. 记住上回的音量。
6. 支持视频预览。
7. 在*.tumblr.com域名下生效，可以是dashboard、个人页、发现页，任君选择。
8. 只支持Tumblr原生视频，不支持instagram、youtube、vimeo。
9. 和其他会修改默认播放器的扩展不兼容，比如“Better Tumblr Video”。