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Sidebar Always Loaded

This script makes the sidebar to be always been ready to show its content, without the need to load it again each time we open the sidebar panel. The panel is just hiding, but without discard its content.

Firefox default behavior is that each time you open the sidebar the content has to load again.

It has two visual modes:

  • Float (default): the sidebar is floating over the tab content. Has options to customize it.
  • Classic: Firefox's default look. Tab content and sidebar content shares the window's space.

Check out a short demo video

  • Any addon (eg: Tree Style Tab) doesn't need to load every time you open the sidebar.
  • Bookmarks or history panels doesn't "lost position". You can search for something there, open a folder or whatever, then close the sidebar and open it again, you'll see that the panel is displaying the same content as when you closed it.

Sidebar shortcut

It has the option to set a keybind to open and close the sidebar.

Within this functionality there's a plus: Auto close. If the shortcut functionality and auto close are enabled, you can press the modifier (ctrl by default) and click somewhere inside the sidebar content and it will close.

For example, that is useful for switching tabs: (I have tabs on the sidebar) I open it with the shortcut and keep pressing ctrl to click a tab to swith to. The sidebar closes and I'm in the clicked tab without having to press the shortcut key combo again.

How to install it

Note that it requires to have an user script loader: You can check the steps here.

  1. Download salf-userchrome.zip
  2. Copy the file salf.uc.js to your profile's chrome folder
  3. Restart Firefox

Note: chrome its a folder that the user can use to customize the Firefox interface. Read more here. If you don't have it, just create that. It is located inside your Firefox profile folder:

In your Firefox address bar type and enter to about:support. There is 'Profile Directory' information, click 'Open Directory'. That's where the chrome folder should be located at.

Restart Firefox: about:profilesRestart normally

Preferences

If float mode is not enabled, then it is activated the "classic" mode, which is the (visually) Firefox default behavior. It does not discard its contents but the UI preferences are handled by the browser itself. That's mean that the "float mode settings" of this script are just for that floating mode.

Sidebar header

You can hide it by toggling the hide_sidebar_header constant to true. This just like the shortcut preferences, are not mode specific so it works on both classic and float modes.

Shortcut preferences

option type default value values
enabled Boolean false true, false
modifier String ctrl ctrl, alt, shift, meta
key String e any valid key
auto_close Boolean true true, false

With those default values (if enabled) the sidebar toggles visibility by pressing ctrl + e.

Float mode specific settings

option type default value values
enabled Boolean true true, false
width String 280px CSS units (px, em, %, etc)
height String 100% CSS units (px, em, %, etc)
position String right left, right
shadow_intst Number 0.12 0 to 1
transparent* Boolean false true, false
slide Boolean true true, false
fade Boolean true true, false
speed Number 0.1 seconds

Note that fade and speed preferences are specific for the sliding (slide) effect.

* Transparent option has blurred background, which uses the backdrop-filter property:

From version 70 this feature is behind thelayout.css.backdrop-filter.enabled and the gfx.webrender.all preferences (both needs to be set to true). To change those preferences, visit about:config.


Note

This script was made under Firefox version 89.0a1 (Nightly, 2021-04-08).
If in a previous versions doesn't work, try this previous script instead (only classic mode; readme).

This is a rework of my other script alfs. That one didn't work anymore in newer versions of Firefox, so I had to redo it. At first, this one didn't had the floating mode so hadn't sense to be in that repo with "floating" in its name.