{"id":20767084,"url":"https://github.com/semanticdata/firefox-fastmail-in-sidebar","last_synced_at":"2026-03-19T17:26:13.748Z","repository":{"id":151970236,"uuid":"617081484","full_name":"semanticdata/firefox-fastmail-in-sidebar","owner":"semanticdata","description":"Firefox extension to display Fastmail within the Firefox sidebar. This extension adds a new section to the sidebar which contains the Fastmail website. 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This extension adds a new section to the sidebar which contains the Fastmail website. It also adds a shortcut, and a button toggle within the toolbar.\n\n[![Get the Addon](https://raw.githubusercontent.com/semanticdata/text-revealer-firefox-extension/master/firefox.png)](https://addons.mozilla.org/en-US/firefox/addon/fastmail-in-sidebar/)\n\n## Usage\n\n1. Toggle the sidebar by pressing _`Alt+Shift+D`_. This shortcut can be changed by going to _`Add-ons` → `Discord in Sidebar` → `Options`_.\n2. If you prefer buttons over shortcuts, there is a toolbar button you can press to toggle the sidebar.\n\n## How to Unlock Firefox Sidebar Width\n\nThe sidebar's width is _locked by default_ in Firefox. Unfortunately, the sidebar is very restrictive and I can only do so much to enhance the functionality of this extension. I put together a step-by-step guide on how to unlock it.\n\n### Step-by-Step Instructions\n\n1. In a new tab, navigate to `about:support`.\n2. Under _Application Basics_, find _Profile Folder_.\n3. Locate and click the `Open Folder` button next to it. It will be next to an address similar to: `%appdata%\\Mozilla\\Firefox\\Profiles\\{profile-id}.default`.\n4. Inside your Firefox _Profile Folder_, create a new folder named: `chrome`.\n5. Inside the newly created chrome folder, create a new file named: `userChrome.css`.\n6. Copy the following code, paste as content and save:\n\n```css\n#sidebar-box {\n  max-width: 40% !important;\n  min-width: 300px !important;\n}\n```\n\n7. Finally, in a new tab, navigate to `about:config` and search for `toolkit.legacyUserProfileCustomizations.stylesheets` and change it to `true`.\n8. Restart Firefox and test it out!\n\n### 📝 Notes\n\n- You can find the canonical publication for the guide on my [Blog](https://miguelpimentel.do/unlock-firefox-sidebar/).  \n- I also have instructions in Spanish in this GitHub [Gist](https://gist.github.com/semanticdata/ee0bca4f3617241aa98da114653c0b08#file-instrucciones-md).\n\n## ⚠ Disclaimer\n\nThis Add-on is primarily for personal use; a personal project if you will. I'm just trying to use Fastmail on the Firefox sidebar. This add-on just launches their website in the sidebar. This extension is an independent project, has no relationship, and is not affiliated to Fastmail in any way.\n\n## 💜 Acknowledgments\n\nIcons used for all my extensions are part of [UXWing](https://uxwing.com/)'s collection. Take a look at their [license](https://uxwing.com/license).\n\n## © License\n\nSource code in this repository is available under the [MIT License](LICENSE).\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsemanticdata%2Ffirefox-fastmail-in-sidebar","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fsemanticdata%2Ffirefox-fastmail-in-sidebar","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fsemanticdata%2Ffirefox-fastmail-in-sidebar/lists"}