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Extensions 
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Slack
Slack is all your team communication in one place, instantly searchable, available wherever you go.
Message deleter for Slack 2.0
Delete Slack messages in bulk - channels, private channels and direct messages supported
Slack Desktop Notifications Visibility Helper
Allows visibility mode configuration for Slack Desktop Notifications
#Clicky for Slack
A Chrome Extension designed to make sharing a link to Slack as quick and easy as possible.
Slack Cleaner, Post Drive to Slack
Tool for bulk delete messages and files on Slack channels. Clean up slack files. Provides posting Google Drive share link to Slack.
ToDoBot - Task Management App for Slack
This extension will allow you to view and manage all your Slack ToDos right in Chrome
Slack Hide Typing
This lightweight extension prevents Slack from sending a typing status to channels and private messages.
Comcast Desktop Sharing for Slack
A simple extension that allows you to stream your desktop into meetings, powered by Comcast webrtc 2.0
Slack Hebrew
In Slack web app: modify direction to rtl, but only for messages containing hebrew characters
