Bookmark Dupes EN

After installing bookmarkdupes, the basic usage is rather simple:

To open bookmarkdupes, click the extension symbol (duplicate stars) or use the link in the options page of the extension.
Do not enable expert mode (unless you know what you are doing, see separate section).
Then select what you want to display:

1. Bookmark duplicates
2. Empty folders
3. Non-duplicate bookmarks</<li>
4. All bookmarks

After this, you will be offered the list of bookmarks with checkboxes; in case 1 the numbers indicate the order in which matching bookmarks were added according to the internally stored date.
There are also button to select/unselect convenient sets of checkboxes.
Finally, there appear buttons to remove the selected bookmarks (or to move them to a “Dupes” folder) in cases 1-3, or to strip the descriptions of the selected bookmarks in case 4. (The latter has some side effects, see section Known Bugs).

Be aware that removing/moving bookmarks or stripping descriptions is irreversible!
It is recommended to make backups of your bookmarks first!

Currently, there is no working version available for android (see section Known Bugs).

Important:
When you reorganized/added/removed bookmarks, make sure to update the
displayed list (by pressing the corresponding button) before removing
bookmarks or stripping descriptions!
In particular, stripping descriptions with an outdated list will move
the corresponding bookmarks to their previous location in the bookmark menu!

Permissions

The extension requires the following permissions for these reasons:

1. “bookmarks” to read/modify bookmarks
2. “storage” to store/restore the customized rules in expert mode.
   Unfortunately, “storage” is not one of the optional_permissions which might be required only if that feature is actually requested by the user, see https://developer.mozilla.org/en-US/Add-ons/WebExtensions/manifest.json/optional_permissions

Expert Mode

When selecting the checkbox for expert mode, details can be configured to
ignore certain bookmarks when calculating the list or under which cases
bookmarks are considered to be dupes of each other.

In non-expert mode, two bookmarks are considered to be duplicates of each other if their URL coincides. In expert mode there are custom rules by which the URL which is actually used for comparison is to be modified. The details are as follows.

For every bookmark the rules are applied in the given order.
There are 2 types of rules: Filter rules and URL modification rules
(there are also disabled rules which are only listed but have no effect).

For both types of rules 4 regular expressions can be specified which are used
to determine if the rule applies: If the corresponding regular expression is
nonempty, the corresponding condition must be satisfied or the rule will not
apply. (In the case of filter rules, at least one of these 4 regular
expressions must be nonempty or that filter rules will not apply either.)

The 4 regular expressions refer to the bookmark's name or url, respectively,
and the regular expressions must either match or not match, respectively.

• The term "regular expression" refers to a javascript type regular expression
  as described e.g. in https://wiki.selfhtml.org/wiki/JavaScript/Objekte/RegExp
  or https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions
• The bookmark's name refers to the full bookmark path as it appears in the
  browser with folder names separated by the null character.
  For instance, if you have in "Bookmark Menu" a folder "Collection"
  which contains your bookmark "Example", the bookmark's name becomes
  "Bookmark Menu\0Collection\0Example" (where \0 denotes the null character
  which can be matched by the regular expression with \0 or \x00).
• The bookmark's url refers to the bookmark url after possible modifications
  by previous modifier rules.

If a filter rule applies, the corresponding bookmark is ignored, i.e.,
it will not be considered as a duplicate and will neither appear in the
list of empty folders or of all bookmarks.

If a URL modification rule applies, a text replacement will occur:
All parts matching a specified regular expression are substituted by a
replacement text (which might be empty).
The rules for this correspond to the javascript String.prototype.replace function with the
global modifier, see e.g. https://wiki.selfhtml.org/wiki/JavaScript/Objekte/String/replace
or https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/String/replace

In particular, the replacement text can contain symbols like
$& or $1 to refer to the whole matched text or to the
match of the first brace in the regular expression…