The Firefox web browser does not have the capability to save the contents of a webpage to a single file, such as an MHTML file, which is a web archive file format that allows one to save the HTML code, images etc. on a webpage into a single file. Though the capability is absent from Firefox, you can add the functionality of saving a page to a single file by installing Save Page WE, an add-on for Firefox by DW-dev. The extension provides the capability to "Save a complete web page (as currently displayed) as a single HTML file that can be opened in any browser. Save a single page, multiple selected pages or a list of page URLs. Automate saving from command line." The saved file is not an MHTML file, or one of the other common web archiving file formats, but it is a single HTML file that Firefox and other browsers can read. Save Page WE is implemented using the WebExtensions API and is available for both Firefox and Chrome with identical functions and user interfaces.

When you start the installation process, you will see a list of the permissions required by the extension:

• Access your data for all websites
• Download files and read and modify the browser's download history
• Display notifications to you
• Access browser tabs
• Access browser activity during navigation

Click on the Add button to add the extension. You should then see the message "Save Page WE was added. Update permissions and data preferences any time in the extension settings." You also have the option to pin the extension to the toolbar.

Select the option to pin the extension to the toolbar, which will result in an icon of a 3.5" floppy disk appearing on the toolbar. You can click on that icon to save the page displayed in the current browser tab.

You can also save a page by hitting the Alt+A key combination (you can cancel the saving of a page with At+C). The file format is HTML rather than MHTML, so the file extension used by SavePageWE is .html, which Firefox can open — if you try to open a file with the .mhtml extension, Firefox will prompt you to use another application to open the file.

Anyone who wishes to have the ability to save a webpage as a single file added to Firefox, can add their voice to the post at Add native Web Archive File support to Firefox, including MHTML, MAFF, and Webarchive...

References

1. How to save a webpage as .mhtml with Firefox?
   Last updated: September 15, 2024
   superuser
2. Add native Web Archive File support to Firefox, including MHTML, MAFF, and Webarchive...
   Date: August 15, 2023
   By: JohnBoyTheGreat
   moz://a Connect

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All sessions are stored in the sessions folder inside your profile directory and can be moved around as with any other file. On a Microsoft Windows 8 system, the sessions folder is in %APPDATA%\Mozilla\Firefox\Profiles\profiledir\sessions. You can find the value of %APPDATA% at a command prompt by issuing the command echo %APPDATA%.

C:\>echo %APPDATA%
C:\Users\JDoe\AppData\Roaming

C:\Users\JDoe\AppData\Roaming\Mozilla\Firefox\Profiles\nqp8058i.default\sessions

To get to that folder, simply select "Open Session Folder" in Session Manager's menu (might not work on all OSes), which you can get to in Firefox on Microsoft Windows by using the Alt-T key combination to show the Tools menu, then selecting Session Manager. Session Manager also allows you to reopen the 10 last closed windows and tabs. You do not need to restart Firefox after installing the Session Manager add-on to begin using it.

To save the Firefox session at any time, take the following steps on a Microsoft Windows system (applies to Firefox 31.0 and Session Manager 0.8.1.5):

1. Use Alt-T key combination to bring up the Tools menu. Alternatively, you can click on the blue floppy disk icon that is placed on the Firefox address bar when you install Session Manager. That icon appears to the left of another icon that is a red cross in a white box which will allow you to reopen recently closed tabs or windows.

   

2. Select Session Manager.
3. Select Session Manager again.
4. Select Save Session.
5. A window will open where you can name the session you are about to save.

   

   Provide a name for the session you wish to save in the "Name" field, which could be the date or anything you like. You can uncheck any tabs you don't want saved for the session.

6. Click on Save Session. Note: when you click on it, it may appear that nothing is happening, but don't click again, give it a few seconds to complete the save.

To load a saved session, go through the same steps to bring up Session Manager, but instead of selecting Save Session select Load Session. You will then see a list of any saved sessions.

If Firefox crashes or you reboot the system without closing Firefox, you will see a window like the one below when you open Firefox, which will give you the option of restoring Firefox to the state it was in when it crashed or from a prior saved session.

References:

1. Session Manager
   Add-Ons
2. Session Manager
   mozdev.org

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