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Hide Activity Details (+ Tweaks) for Trello

This extension tweaks a few things in Trello. Each tweak can be switched on or off in settings.

Download it below


Hide the Activity details on cards

When viewing a card, everything that was ever done to that card is displayed at the bottom. This is far more much information than most people care about, and it cluttered it so that comments were swamped. You can hide this by clicking “Hide Details”, but Trello doesn’t always remember your choice. You can set this extension to click that link for you every time you open a card. Activity details are always there, if you need them. Just click “Show Details”.

Trello card showing all the activity entries Trello card with all the activity entries hidden
before and after

Hide completed items in checklists on cards

I use checklists all the time, and only want to see the items I have left to do. You can hide completed items by clicking “Hide completed items” above the checklist, but Trello doesn’t hide them by default. You can set this extension to click that link for you every time you open a card. Your completed items don’t go anywhere, just click “Show checked items” to see them again. They’ll be hidden the next time you open the card.

Trello card showing all the activity entries Trello card with all the activity entries hidden
before and after

Make clickable icons for URLs in card titles

If you put a URL in the title of a card, this option adds a clickable icon on the card so that you can visit the URL without having to open the card.

Show label text on cards

In list view, card labels are shown as a strip of colour. If you have given the label a name, this can also be displayed. Trello doesn’t make it obvious that you can do this. This option persists your choice between logins.

Place the cursor in Two Factor Authentication Code field when logging in

If you have two factor authentication enabled, this option makes logging in a little less annoying by placing the cursor in the second factor field when it appears, removing the need to click into it.

Make clickable icons for Atlassian issues (JIRA and Fisheye) in card titles

If you put a JIRA or Fisheye issue reference in the title of a card, this option adds a clickable icon on the card so that you can visit the ticket with a single click.

Get it

Download for Firefox

Download for Opera

Download for Edge

Contact me

You can email me at beingmrkenny.extensions@gmail.com ✉️

Tip jar

I work a full time job and don’t get to spend as much time on this extension as I wish I could. If you’d like to support development, the easiest way to do it is PayPal.

Firefox and Private Windows

Firefox’s privacy settings allow you to choose whether extensions have access to pages in Private Windows. This helps protect your privacy and gives you greater choice. All extensions are disabled in Private Windows is disbaled by default. This means that if, in a Private Window, you view a website that this extension is configure to work with, it will not function on that website.

If you have configured Firefox to be permanently in Private mode (as I have), all functionality of this extensions will be disabled. If you would like this extension to work in Private Windows, you will need to allow the extension to access to Private Windows. This can be done from the Add-ons page. More information, including how to change privacy settings, is available at Mozilla’s page, Extensions in Private Browsing.

I am an advocate of full user privacy on the internet. Full privacy information about this extension is available below, but to summarise I do not collect any of your data and I never will.


This extension is only tested in the most recent versions of the browsers it is available for. Currently this includes: Firefox, Opera, Chrome, and Edge. Please ensure your browser is kept up-to-date as this extension may rely on features only available in the latest available version of your browser. This extension will never rely on browser features that have not yet been released to the general public.

I cannot guarantee that this extension will not interfere with other extensions or add-ons, especially those extensions which work with the sites this extension work with. If you notice an issue, please get in touch and I will do my best to resolve the issue.


The latest version number of this extension will always be published below. If the version in your browser is greater than that number, this extension may have been compromised. You should uninstall it and get in touch on the email above.

This extension limits itself to trello.com. All extensions can read the page content on sites you visit, as well as tracking your interactions with the page you are visiting. This can also include text you type into forms. For this reason, all extensions undergo a review process before they are available to install. You should consider disabling or uninstalling extensions you no longer use. In Chrome you can also manually limit extensions to specific domains.


This extension stores only your settings. It does not track your behaviour or retain any of your data, nor does it collect any personal information or page content. It does not send any data to analytics services or anywhere else.

The settings you choose are saved by your browser and are not passed to any other service by this extension. If you are signed into Firefox Sync or Chrome’s sync feature, your browser will store those settings in your account and will synchronise them between signed-in computers. These settings are not accessible to the developer of this extension. Synchronisation is not yet supported by Opera.

I don’t have analytics or advertising setup anywhere in this extension or on this website.

The only time I know anything about you or how you use this extension is if you get in touch and tell me yourself.

Extension permissions

This extension has been built to require as few permissions from you as possible. Below is an explanation of the ones that it does.

In Firefox and Opera, site-specific permissions are requested when extensions are installed or updated. Chrome does not have this step on installation, and reports that this extension has access to sites you visit (as it does with all extensions). In any case, this extension limits itself to pages at the relevant domains, and does not access any other sites you visit.


If you want to view the code that powers this extension, the repository is at https://github.com/beingmrkenny/HideActivityForTrello.

Version history

Dates refer to when the extension was submitted for review. Actual availability dates may vary due to different browsers’ review procedures.