11 Best Gmail Firefox Extensions

Gmail has given way to Google Inbox, and Google Chrome has been winning the battle against Mozilla Firefox. But this one's for the loyalists who hold on to two of the internet's most memorable brands. If you heart Firefox and Gmail, you'll love these extensions.

Recently, I explored Chrome's best Gmail extensions, and as luck would have it, five of those are on Firefox too: ActiveInbox, Notifus, Checker Plus for Gmail, MailTrack, and Simple Gmail Notes. Naturally, the best is the best, regardless of which browser you use.

Nonetheless, Firefox has plenty of exclusive extensions that Chrome users would kill for.

1. ActiveInbox: Send Mails Later, Use Gmail for Tasks

If you're a Gmail power user, this is the best extension you can install, and well worth the $50 per year.

That cost includes every major feature missing in Gmail, which you would normally pay for, like:

Schedule emails to send later.
Add tasks.
Set due dates for emails and tasks.
Add follow-up reminders.

Competitors like Boomerang, FollowUp.cc, or mxHero Toolbox are great, but ActiveInbox is a better solution to deal with inbox overload and email to-do lists.

Download: ActiveInbox for Firefox

2. Notifus: Reminder for Unanswered Emails

Notifus is a free add-on that sends reminders about important emails that you haven't received a reply on. Instead of the "Send" button, click one of the buttons to "Send and remind me in X days." It's that easy, and it works.

To use Notifus, you will need to install GreaseMonkey for Firefox first.

Download: GreaseMonkey for Firefox | Notifus for Firefox

3. Checker Plus for Gmail: If You Don't Always Keep Gmail Open

Checker Plus is an icon in your toolbar that notifies you of new messages. It also lets you perform basic actions like marking it as read or deleting it. And it can open the mobile version of Gmail in a small pop-down pane too.

Download: Checker Plus for Gmail

4. Mailtrack: Did the Recipient Read Your Email?

To see if someone has received and read an important email, Mailtrack is the easiest free and unlimited solution. One green tick indicates it has reached the recipient's inbox, and a second green tick shows it has been read. Simple and easy.

Download: Mailtrack for Firefox [Broken URL Removed]

5. Simple Gmail Notes: Sticky Notes Only You Can See

Simple Gmail Notes lets you add sticky notes to a message. You can customize the color and font size of the note, and even turn it into a quick Calendar event. All the notes are stored on your Google Drive, so your data isn't going to a third party.

Download: Simple Gmail Notes for Firefox

6. Trimless for Gmail: Show the Full Message

By default, Gmail trims the end of messages. This can be email signatures or contents of the previous mails in the chain. Either way, if you want Gmail to show the full message without trimming the end, this is the extension you need. Trimless has one job, and it does that job perfectly.

Download: Trimless for Gmail for Firefox

One of Firefox's best exclusive features is the customizable sidebar. Extensions like All-In-One Sidebar are irreplaceable and have no comparable alternatives on other browsers.

Gmail Mail Sidebar, as the name suggests, puts the mobile version of Gmail in the Firefox sidebar. This way, you can have your inbox always open, and use it much like you use the Gmail app on your iPhone or Android phone.

Download: Gmail Mail Sidebar for Firefox

8. Shortcuts for Gmail: More Keyboard Shortcuts

Learning keyboard shortcuts can make Gmail faster and more productive than ever before. If you already know the best ones, then Shortcuts for Gmail adds 12 more you might need.

It introduces shortcuts to select message contents, expand/shrink trimmed parts, navigate between links, undo actions, change text color, and go to the next or previous page.

Download: Shortcuts for Gmail for Firefox [No Longer Available]

9. DNDEmail: Stop Incoming Messages From Distracting You

A notification of a new email can be a distraction. You stop what you're doing to check the message, which can be unimportant. But that small switch ends up causing a major shift in your workflow, breaking your concentration. It's a good practice to turn off distracting tech notifications to be more productive.

DNDEmail stops Gmail from showing new emails to you for set periods of time. For example, you can tell Gmail to show you emails at every hour, rather than as soon as they come in. It's a "Do Not Disturb" sign for your inbox. And of course, you can whitelist important people like your boss, so you see their messages instantly.

Download: DNDEmail for Firefox

10. Wisestamp: Easy, Rich Gmail Signatures

Gmail lets you add custom signatures in settings, but these don't always look great. Wisestamp is the easy way to create good-looking signatures with tons of information.

You can add a photo, links to social profiles, and other data about yourself. Customizing the look of the signature is also a breeze. For more, we have a full guide to spice up Gmail signatures with Wisestamp.

Download: Wisestamp for Firefox

11. Grammarly: Spellcheck for Gmail

Emails are often meant to be professional. And misspellings or bad grammar will quickly make your important email seem like you don't care enough to proofread it. Grammarly is the easy fix for this.

Grammarly will suggest corrections for spellings, grammar, common phrases, and other mistakes. Like with Microsoft Word, look for words with a red underline. Click the words to find Grammarly's suggestions.