Rollback to 2.3.17 due to reported bugs in 2.3.18.

Fixes:
- Firefox on desktop was broken when using storage fallback mode.
- Firefox on desktop's scrolling in the Stylus popup was randomly disabled.

Known bugs:
- Firefox: can't install .user.css from a local file system.

* Big rewrite to build the add-on to support Chrome manifest v3
* Automatic styles database backup
* Fix dark mode detection
* Fix import & export
* Fix popup visibility in Firefox
* UI changes - reorder buttons & switch to action icons
* Editor auto-complete updates
* Minor performance improvements
* Lots of bug fixes

* Fix dialog height
* Don't add date to new style name
* Ignore unknown stylelint rules
* Fix temporary flyout
* Various bug fixes

* Fix sign-in to sync and userstyles.world in Vivaldi
* Editor: right-click a ⏵collapsed section in the sidebar/header to temporarily open it
* Improve popup search category heuristics
* Update stylelint to 16.5.0
* Update csslint
* Various bug fixes

* Fix show save & clip error text
* Fix USW api issue
* Restore sublime editor bookmarks correctly
* Fix parser library
* Update locales

* Link to preprocessor playground in error box
* Hide preview errors when empty
* Parserlib: allow empty doc targets
* Move icons into images
* Update locales

* Circumvent CSP on AMO and other https sites in Firefox
* Fix `:has()` with multiple relative selectors
* Handle broken strings produced by a bugged `@preprocessor`
* Use a global `Test` button for all regexps of the style
* Allow tag selectors in nested CSS per the newest spec
* Show progress in popup when downloading style search index
* Bump Firefox `strict_min_version` to 57 to ensure compatibility with Android
* [installer] Allow adding custom sites and fix theme option
* [Editor] Fix active editor tab on Chrome startup
* [Editor] Fix live preview with `adoptedStyleSheets`
* [Editor] Increase `undoDepth` from 200 to 1000
* [CSSLint] New `style-rule-nesting` rule to warn about new CSS nesting syntax
* [Manager] Show descriptive age & full year in style tooltip
* [Options] New option for popup's max width to enable autofit-to-content
* Other various fixes
* Update dependencies

* Fix multiple editor issues
* Fix section numbering
* Fix several icons
* Fix CSP nonce
* Update locales

## Version 1.5.35
Aug 29, 2023

* show autosaved draft's css code prior to confirming + auto-remove the autosaved draft when saving
* csslint: fix/reduce the probability of outdated warnings during editing after the problem is fixed (previously one would have to cut and paste back the line to make the error go away)

## Version 1.5.34
Aug 15, 2023

* apply eyedropper color immediately
* fix autocomplete of "foo-" to handle the trailing "-"
* fix hightlighting of nested CSS in CodeMirror
* open installer for .user.less
* remember all editor options
* remember searchMode in manager
* stylelint 15.10.2

Only reuse parent styles in url-less frames (bug fix)

Version 1.5.31
May 9, 2023

* New syntax for nested selectors
* Fix manager when showing options
* Fix dark mode eye dropper
* Update preview when config changes
* New beautify options
* Fix CSP patching
* Check known distro url correctly, just once
* Add option for URL installer
* Various fixes (hue constraints, section naming, code size)
* Update locales
* Update dependencies

* Fix color picker alignment
* Fix USO install
* Remove link to Opera addon
* Made "Write style for:" clickable
* Various bug fixes
* Update dependencies

* Fix sync connection in Vivaldi
* Fix USO site installation
* Support `has()` selector
* Update dependencies
* Various bug fixes

* Database bug fix

Version 1.5.24 (May 30, 2022)

* Limit editor height to viewport
* Add hwb color support
* Add usercss write option in popup
* Improve compact mode
* Update dependencies
* Various bug fixes

Version 1.5.23 (March 19, 2022; beta only)

* Add eyedropper support
* Fix iframe styles
* Support inclusions
* Add WebDAV sync
* Fix compatibility with kiwi
* Add draggable list to adjust injection order
* Add per-style setting for autoupdate
* Add dark theme
* Update dependencies
* Various bug fixes

* Update translations
* Update to CodeMirror 5.62.3
* Fix CSS linting in CodeMirror
* Updated parserlib

* Show USw error
* Update to CodeMirror 5.62.2
* Allow `@import` from any url
* Various bug fixes

Fix syncing
Shrink screenshots
Update internal libraries
Various bug fixes

- Fix locales broken in 1.5.16
- Update CodeMirror editor